Pubity on Instagram: "😲 The first true roller coaster appeared in 1884, when Switchback Railway opened to the public. Designed by LaMarcus Adna Thompson, it featured simple wooden tracks with small hills that riders traveled at about six miles per hour, paying five cents for the ride. Inspired by earlier gravity railways in Russia, it laid the foundation for modern roller coasters and quickly sparked their popularity worldwide. (Via ViralHog) #surprise"

Galaxies on Instagram: "A miniature capsule shoots off at 4000 km per hour, mimicking the aerodynamics of a Mars atmospheric entry before crashing at supersonic speeds into a wall. The tiny replica of the Entry, Descent and Landing Module (EDLM) blasts off from a smooth bore gun faster than a speeding bullet. This video has been slowed down 60 times – the actual flight lasted just half a second. This activity is part of a series of free-flight experiments with a scaled-down version of the ExoMar