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New research suggests that the way chameleons change color is very different from what scientists had assumed. In this week’s "Today I Learned" filmmaker and National Geographic Grantee Jason Jaacks explains that the color change is controlled by nanocrystals in a top layer of the lizards' skin.

Read more video.nationalgeographic.com

l794G TIL that in the 1990s, the CIA developed a robotic catfish named "Charlie." This unmanned underwater vehicle was designed to collect water samples covertly, controlled via a line-of-sight radio handset. The details of its missions remain classified.
poxN TIL in 1997 the founder and chief editor of Vegetarian Times magazine, Paul Obis, shocked readers by suddenly resigning saying “Twenty two years of tofu is a lot of time” and “I want to go to Wrigley Field and have a hot dog”.
nBPo TIL when asked what would happen if he were invited to a dinner party with his characters, Dr. Seuss said, “I wouldn’t show up.”
yVbMv TIL Medicine caps have protective caps due to a person in Chicago lacing Tylenol containers with Cyanide. The killer was never found.
R7DM4 TIL that within the animal kingdom, only higher primates (including humans) and guinea pigs are unable to synthesize Vitamin C in their own bodies, thus putting them at risk of scurvy