Sitting around a campfire, you can feel its heat, smell the woody smoke, and hear it crackle. If you get too close, it burns your eyes and stings your nostrils. You could stare at the bright flames forever as they twist and flicker in endless incarnations… But what exactly are you looking at? Elizabeth Cox illuminates the science behind fire. Lesson by Elizabeth Cox, directed by Héloïse Dorsan Rachet.
What makes the Inca Empire so fascinating to archaeologists and historians is that they specialized in achieving the impossible. They conquered a huge empire without the use of wheeled vehicles or horses to pull them. They had no system of writing but managed somehow to maintain administrative control of far-flung provinces thousands of miles from their capital.
It feels like a biological blooper: A persistent itch is made worse by scratching, the one thing that provides instantaneous relief. Evolutionary biologists have proposed that the relationship between scratching and itching developed when disease-carrying parasites and insects bit humans, causing itching skin; scratching brushed the bugs away. Anyone suffering from a mosquito bite can understand that connection.
If the holiday season has you feeling stressed, here’s an opportunity to take a break from making travel plans and brainstorming gift lists. This picture puzzle from Attic Self Storage features six hidden items, and it takes most people a few minutes to find them all.
Movie soundtracks can be big business—sometimes bigger than the movie itself. (And sometimes better than the film itself.) In early December 2018, three soundtracks were in the Billboard Top 10, and Mariah Carey’s Glitter soundtrack has been in the news recently for reentering the charts. But they have a long way to go before entering the top echelon.
via NASA Image of the Day https://ift.tt/2SFSutQ NASA astronauts Anne McClain (background) and Serena Auñón-Chancellor are pictured inside the U.S. Destiny laboratory module aboard the
via NASA Image of the Day https://ift.tt/2RWygvR Spirit of Apollo – 50th Anniversary of Apollo 8