JS animointia

https://www.khanacademy.org/computing/computer-programming/programming/animation-basics/p/challenge-exploding-sun
https://www.khanacademy.org/computing/computer-programming/programming/animation-basics/p/challenge-tasty-tomato
https://www.khanacademy.org/computing/computer-programming/programming/animation-basics/p/challenge-mouse-movement-mania
https://www.khanacademy.org/computing/computer-programming/programming/animation-basics/p/challenge-parting-clouds
 http://www.khanacademy.org/computer-programming/spin-off-of-project-shooting-star/4525618515542016