How do you prove that a black hole exists? It is so dense, not even light can escape its grasp
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/20110520104017atomic_clocks.jpg)
The official Keepers of Time will add a leap second to the world’s master clocks (in the U.S. Naval Observatory) on December 31 at 23:59:59 UTC
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/greene_greene_631.jpg)
A new exhibition celebrates the work of brothers Charles and Henry Greene, masters of American Arts and Crafts architecture
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/20110520104017phot-45b-08-normal.jpg)
That’s right. These three undergraduates from Leiden University in the Netherlands discovered a planet, and not just any old planet
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/4e/51/4e51f68b-0320-4dac-adf4-310f35e04760/3155559076_e7bd0f1280_b.jpg)
Scientists found six species of moss in the stomach of the famous five thousand-year-old glacier mummy
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/creche-of-the-abbey-of-regina-laudis-631.jpg)
In rural Connecticut, a 300-year-old nativity scene is brought back to life by the Metropolitan Museum of Art
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/38/56/385682c6-e9c4-4199-a87e-bc21a7227468/mental_hospital_philadelphia_pa_micrograph_by_langenheim__co_ca_1858.jpg)
A history of the method used to transmit letters during World War II
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/201105201040163046028649_4ed140e6b42.jpg)
Charles Seife wrote an op-ed for yesterday's New York Times about the recount in Minnesota, which seems like it ought to be a simple problem but isn't
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/74/74/74749770-0d27-4943-959d-768e369565a8/11230039975_7ff6f55470_b.jpg)
Cheers! Today marks the 75th anniversary of the US government changing its mind about Prohibition
Page 1083 of 1280
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/20110520085958guitar_cake.jpg)
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/amazonie_deforestation.jpg)
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/20110520083111skorpiovenator.jpg)
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/20110520085957ethiopian_food-300x213.jpg)
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/36/4e/364e9b75-5165-4e48-8e8e-597b88a372fd/alec_soth_headshot.jpeg)
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/2327243497_b0b6baede9_b.jpg)
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/36/bb/36bbd676-4e63-4d1a-997e-4683a91a7b0a/1200px-tyrannosaurus_rex_holotype.jpg)
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/1933-worlds-fair-poster-520.jpg)
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/20110520083111brontosaur.jpg)
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/art-market-national-museum-national-indian-520.jpg)