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The sky appears blue for a combination of two reasons. Before white light reaches the Earth's surface, the light waves collide with and bounce off of the nitrogen and oxygen atoms in the atmosphere. Different frequencies of light (in other words different colours) are scattered differently. Higher frequencies (blue and purple) are more easily scattered and thus bounce around in all different directions more than lower frequencies (red or orange) do. The scattering of high frequencies alone would cause the sky to appear blue and purple, but our eyes work better at frequencies near the middle of the spectrum (yellow and green). Since the colour blue is closer to yellow or green than purple is, the sky we see appears blue.

oG4L TIL that in the novel, Forrest Gump goes to space on a NASA mission. It crash lands on an island where he’s stuck for years. These scenes weren’t in the movie, but Tom Hanks did go on to star in Apollo 13 and Castaway.
ZyvD TIL that “Breaking Bad” writer and director Vince Gilligan became a professional writer after submitting a fan script to “The X-Files” for its 2nd season. It became an episode and he went on to be a regular writer and producer on the X-Files.
QJbxd TIL The Eagles have two of the top three highest-selling albums of all time in the US.
RkP8 TIL a sample of Sir Isaac Newton’s apple tree was sent into space to ‘defy gravity.’
Y7jnr TIL The Wire Fox Terrier has won the most Best in Show awards at the Westminster Kennel Club Dog Show, with 15 wins. The Scottish Terrier and English Springer Spaniel come in 2nd and 3rd place respectively