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[Source](https://www.amnh.org/education/resources/rfl/web/essaybooks/cosmic/cs_paradox.html "Permalink to kernel (20)")
# kernel (20)
* [Skip to Page Content][3]
* [Skip to Site Navigation][4]
* [Skip to Search][5]
* [Skip to Footer][6]
# ![American Museum of Natural History][7]
__ __ __
[My Profile][8] | [Log Out][9] [Log In][10] | [Register][11]
[My Profile][8] | [Log Out][9] [Log In][10] | [Register][11]
* [ __Plan Your Visit ][12]
The Museum is open daily from 10 am to 5:45 pm except on Thanksgiving and Christmas. 
* [Accessibility ][13]
* [Admissions & Ticketing][14]
* [Directions ][15]
* [Museum Map][16]
* [Food and Drink][17]
* [Plan a School or Camp Field Trip][18]
* [Plan Your Group Visit][19]
* [Sleepovers][20]
* [Tours][21]
* [Visitor Tips][22]
* [Shop][23]
* # Self-Guided Tours
* [Dino Tour][24]
* [Earth and Space Tour][25]
* [Highlights Tour][26]
* [Night At The Museum Tour][27]
* [Theodore Roosevelt Tour][28]
* [Whales Tour][29]
* [ __Exhibitions ][30]
* # [Current Exhibitions][31]
* [Butterfly Conservatory][32]
* [Earthflight][33]
* [Inside You][34]
* [Opulent Oceans ][35]
* [Our Senses][36]
* [Space Show: Dark Universe][37]
* # [Upcoming Exhibitions][38]
* [Unseen Oceans][39]
* # [Past Exhibitions][40]
* [Countdown to Zero: Defeating Disease ][41]
* [¡Cuba!][42]
* [Dinosaurs Among Us][43]
* [Humpback Whales][44]
* [Mummies][45]
* # [Permanent Exhibitions][46]
* [The Titanosaur ][47]
* [ __Learn & Teach ][48]
* # Find Programs and Resources for...
* [Adults][49]
* [Class Field Trips][50]
* [Educators][51]
* [Families][52]
* [Pre-K to Grade 2][53]
* [Grades 3-5][54]
* [Grades 6-8][55]
* [Grades 9-12][56]
* [Post Secondary][57]
* [Adventures in Science][58]
* [After-School Program][59]
* [Curriculum Collections][60]
* [Evaluation, Research, and Policy][61]
* [Master of Arts in Teaching][62]
* [Online Courses for Educators][63]
* [Urban Advantage][64]
* [BridgeUp: STEM][65]
* [ __Explore ][66]
* [Exhibitions][30]
* [OLogy][67]
* [Videos][68]
* [News and Blogs][69]
* [Science Bulletins][70]
* [Shelf Life][71]
* [Origami at the Museum][72]
* [Margaret Mead Film Festival][73]
* # Science Topics
* [Climate Change][74]
* [Cosmology][75]
* [Dinosaurs][76]
* [Whales][77]
* [Explore All Topics ][78]
* [ __Our Research ][79]
* # Divisions
* [Anthropology][80]
* [Invertebrate Zoology][81]
* [Paleontology][82]
* [Physical Sciences][83]
* [Astrophysics][84]
* [Earth and Planetary Sciences][85]
* [Vertebrate Zoology][86]
* [Herpetology][87]
* [Ichthyology][88]
* [Mammalogy][89]
* [Ornithology][90]
* [Richard Gilder Graduate School][91]
* [Hayden Planetarium][92]
* [Center for Biodiversity and Conservation][93]
* [Sackler Institute for Comparative Genomics][94]
* [Southwestern Research Station][95]
* [Research Library][96]
* [Microscopy and Imaging Facility][97]
* [Natural Science Collections Conservation][98]
* [Computational Sciences][99]
* [Darwin Manuscripts Project][100]
* [Science News][101]
* [Staff Directory][102]
* [Scientific Publications][103]
* [ __Calendar ][104]
* [ __Join & Support ][105]
* [ __Tickets ][106]
__
share:
: [ ![Share this page on Facebook][107] ][108]
: [ ![Tweet this page][109] ][110]
: [ ![E-mail this page][111] ][112]
: [ ![Share this page on Google +][113] ][114]
:
Collect
# Error Page
The page you have requested could not be found.  [Click here][115] to return to the AMNH homepage.
# __
* Page footer
* * [Follow @amnh][116]
* # American Museum of Natural History
Central Park West at 79th Street
New York, NY 10024-5192
Phone: 212-769-5100
Open daily from 10 am-5:45 pm
except on Thanksgiving and Christmas
[Maps and Directions][117]
: ![youtube][118]
: ![twitter][119]
: ![facebook][120]
: ![instagram][121]
: ![podcast][122]
: ![pinterest][123]
: ![tumblr][124]
: ![Google Plus][125]
: ![appstore][126]
: ![Google Play][127]
: ![Snapchat][128]
: ![Flipboard][129]
* [Traveling Exhibitions][130]
* [Host an Event][131]
* [Shop][132]
* [About the Museum][133]
* [The Gilder Center][134]
* [News and Blogs][69]
* [Videos][68]
* [Apps][135]
* [Accessibility ][13]
* [Visitor Information][136]
* [Press Center][137]
* [Contact Us][138]
* [Careers][139]
* [Privacy][140]
* [Copyright Information][141]
* [Non-Discrimination Notice][142]
![][143]
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[3]: https://www.amnh.org#amnhContent "Skip to page content"
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[5]: https://www.amnh.org#keyword "Skip to search"
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[11]: https://www.amnh.org/apiuser/register
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[23]: https://www.amnh.org/plan-your-visit/shop "Shop"
[24]: https://www.amnh.org/plan-your-visit/self-guided-tours/dino-tour "Dino Tour"
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[26]: https://www.amnh.org/plan-your-visit/self-guided-tours/highlights-tour "Highlights Tour"
[27]: https://www.amnh.org/plan-your-visit/self-guided-tours/night-at-the-museum-tour "Night At The Museum Tour"
[28]: https://www.amnh.org/plan-your-visit/self-guided-tours/theodore-roosevelt-tour "Theodore Roosevelt Tour"
[29]: https://www.amnh.org/plan-your-visit/self-guided-tours/whales-tour "Whales Tour"
[30]: https://www.amnh.org/exhibitions "Exhibitions"
[31]: https://www.amnh.org/exhibitions/current-exhibitions "Current Exhibitions"
[32]: https://www.amnh.org/exhibitions/the-butterfly-conservatory "Butterfly Conservatory"
[33]: https://www.amnh.org/exhibitions/3d-and-2d-films/earthflight "Earthflight"
[34]: https://www.amnh.org/exhibitions/inside-you "Inside You"
[35]: https://www.amnh.org/exhibitions/opulent-oceans "Opulent Oceans "
[36]: https://www.amnh.org/exhibitions/our-senses "Our Senses"
[37]: https://www.amnh.org/exhibitions/space-show/dark-universe "Space Show: Dark Universe"
[38]: https://www.amnh.org/exhibitions/upcoming-exhibitions "Upcoming Exhibitions"
[39]: https://www.amnh.org/exhibitions/unseen-oceans "Unseen Oceans"
[40]: https://www.amnh.org/exhibitions/past-exhibitions "Past Exhibitions"
[41]: https://www.amnh.org/exhibitions/countdown-to-zero "Countdown to Zero: Defeating Disease "
[42]: https://www.amnh.org/exhibitions/cuba "¡Cuba!"
[43]: https://www.amnh.org/exhibitions/dinosaurs-among-us "Dinosaurs Among Us"
[44]: https://www.amnh.org/exhibitions/3d-and-2d-films/humpback-whales "Humpback Whales"
[45]: https://www.amnh.org/exhibitions/mummies "Mummies"
[46]: https://www.amnh.org/exhibitions/permanent-exhibitions "Permanent Exhibitions"
[47]: https://www.amnh.org/exhibitions/permanent-exhibitions/fossil-halls/miriam-and-ira-d.-wallach-orientation-center/the-titanosaur "The Titanosaur "
[48]: https://www.amnh.org/learn-teach "Learn & Teach"
[49]: https://www.amnh.org/learn-teach/adults "Adults"
[50]: https://www.amnh.org/plan-your-visit/school-or-camp-group-visit "Class Field Trips"
[51]: https://www.amnh.org/learn-teach/educators "Educators"
[52]: https://www.amnh.org/learn-teach/families "Families"
[53]: https://www.amnh.org/learn-teach/pre-k-to-grade-2 "Pre-K to Grade 2"
[54]: https://www.amnh.org/learn-teach/grades-3-5 "Grades 3-5"
[55]: https://www.amnh.org/learn-teach/grades-6-8 "Grades 6-8"
[56]: https://www.amnh.org/learn-teach/grades-9-12 "Grades 9-12"
[57]: https://www.amnh.org/learn-teach/post-secondary "Post Secondary"
[58]: https://www.amnh.org/learn-teach/families/adventures-in-science "Adventures in Science"
[59]: https://www.amnh.org/learn-teach/grades-9-12/after-school-program "After-School Program"
[60]: https://www.amnh.org/explore/curriculum-collections "Curriculum Collections"
[61]: https://www.amnh.org/learn-teach/evaluation-research-and-policy "Evaluation, Research, and Policy"
[62]: https://www.amnh.org/learn-teach/master-of-arts-in-teaching "Master of Arts in Teaching"
[63]: https://www.amnh.org/learn-teach/seminars-on-science "Online Courses for Educators"
[64]: https://www.amnh.org/learn-teach/educators/urban-advantage "Urban Advantage"
[65]: https://www.amnh.org/learn-teach/adults/bridgeup-stem "BridgeUp: STEM"
[66]: https://www.amnh.org/explore "Explore"
[67]: https://www.amnh.org/explore/ology "OLogy"
[68]: https://www.amnh.org/explore/amnh.tv "Videos"
[69]: https://www.amnh.org/explore/news-blogs "News and Blogs"
[70]: https://www.amnh.org/explore/science-bulletins "Science Bulletins"
[71]: https://www.amnh.org/shelf-life "Shelf Life"
[72]: https://www.amnh.org/explore/origami-at-the-museum "Origami at the Museum"
[73]: https://www.amnh.org/explore/margaret-mead-film-festival "Margaret Mead Film Festival"
[74]: https://www.amnh.org/explore/science-topics/climate-change "Climate Change"
[75]: https://www.amnh.org/explore/science-topics/cosmology "Cosmology"
[76]: https://www.amnh.org/dinosaurs "Dinosaurs"
[77]: https://www.amnh.org/explore/science-topics/whales "Whales"
[78]: https://www.amnh.org/explore/science-topics "Explore All Topics "
[79]: https://www.amnh.org/our-research "Our Research"
[80]: https://www.amnh.org/our-research/anthropology "Anthropology"
[81]: https://www.amnh.org/our-research/invertebrate-zoology "Invertebrate Zoology"
[82]: https://www.amnh.org/our-research/paleontology "Paleontology"
[83]: https://www.amnh.org/our-research/physical-sciences "Physical Sciences"
[84]: https://www.amnh.org/our-research/physical-sciences/astrophysics "Astrophysics"
[85]: https://www.amnh.org/our-research/physical-sciences/earth-and-planetary-sciences "Earth and Planetary Sciences"
[86]: https://www.amnh.org/our-research/vertebrate-zoology "Vertebrate Zoology"
[87]: https://www.amnh.org/our-research/vertebrate-zoology/herpetology "Herpetology"
[88]: https://www.amnh.org/our-research/vertebrate-zoology/ichthyology "Ichthyology"
[89]: https://www.amnh.org/our-research/vertebrate-zoology/mammalogy "Mammalogy"
[90]: https://www.amnh.org/our-research/vertebrate-zoology/ornithology "Ornithology"
[91]: https://www.amnh.org/our-research/richard-gilder-graduate-school "Richard Gilder Graduate School"
[92]: https://www.amnh.org/our-research/hayden-planetarium "Hayden Planetarium"
[93]: https://www.amnh.org/our-research/center-for-biodiversity-conservation "Center for Biodiversity and Conservation"
[94]: https://www.amnh.org/our-research/sackler-institute-for-comparative-genomics "Sackler Institute for Comparative Genomics"
[95]: https://research.amnh.org/swrs/ "Southwestern Research Station"
[96]: https://www.amnh.org/our-research/research-library "Research Library"
[97]: https://www.amnh.org/our-research/microscopy-and-imaging-facility "Microscopy and Imaging Facility"
[98]: https://www.amnh.org/our-research/natural-science-collections-conservation "Natural Science Collections Conservation"
[99]: https://www.amnh.org/our-research/computational-sciences "Computational Sciences"
[100]: https://www.amnh.org/our-research/darwin-manuscripts-project "Darwin Manuscripts Project"
[101]: https://www.amnh.org/our-research/science-news2 "Science News"
[102]: https://www.amnh.org/our-research/staff-directory "Staff Directory"
[103]: https://www.amnh.org/our-research/scientific-publications "Scientific Publications"
[104]: https://www.amnh.org/calendar "Calendar"
[105]: https://www.amnh.org/join-support "Join & Support"
[106]: https://ticketing.amnh.org/#/tickets "Tickets"
[107]: https://www.amnh.org/extension/amnh/design/amnh_user/images/icons/social/social_facebook_16.png
[108]: https://www.facebook.com/sharer.php?u=
[109]: https://www.amnh.org/extension/amnh/design/amnh_user/images/icons/social/social_twitter_16.png
[110]: https://twitter.com/intent/tweet?text=&url=
[111]: https://www.amnh.org/extension/amnh/design/amnh_user/images/icons/social/social_email_16.png
[112]: mailto:?subject=&body=%3A%20
[113]: https://www.amnh.org/extension/amnh/design/amnh_user/images/icons/social/social_google_16.png
[114]: https://plus.google.com/share?url=
[115]: https://www.amnh.org/
[116]: https://twitter.com/amnh
[117]: https://www.amnh.org/plan-your-visit/#directions
[118]: https://www.amnh.org/extension/amnh/design/amnh_user/images/youtube.png
[119]: https://www.amnh.org/extension/amnh/design/amnh_user/images/twitter.png
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[130]: https://www.amnh.org/global-business-development/traveling-exhibitions "Traveling Exhibitions"
[131]: https://www.amnh.org/host-an-event "Host an Event"
[132]: https://shop.amnh.org/ "Shop"
[133]: https://www.amnh.org/about-the-museum "About the Museum"
[134]: https://www.amnh.org/about-the-museum/richard-gilder-center-for-science-education-and-innovation "The Gilder Center"
[135]: https://www.amnh.org/apps "Apps"
[136]: https://www.amnh.org/plan-your-visit "Visitor Information"
[137]: https://www.amnh.org/about-the-museum/press-center "Press Center"
[138]: https://www.amnh.org/about-the-museum/contact-us "Contact Us"
[139]: https://www.amnh.org/about-the-museum/careers "Careers"
[140]: https://www.amnh.org/privacy-policy "Privacy"
[141]: https://www.amnh.org/about-the-museum/copyright "Copyright Information"
[142]: https://www.amnh.org/about-the-museum/notice-of-non-discrimination-and-harassment "Non-Discrimination Notice"
[143]: //googleads.g.doubleclick.net/pagead/viewthroughconversion/984088422/?value=1&guid=ON&script=0
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