A guide to understanding the universe around you. Using science to teach people how to better grasp the beauty of the world around them. Using the beauty of the world to teach science.
This blog will focus on physics and astronomy, but all science is fair game. Also expect math, technology and other things that inspire critical thinking.
By the way, the name's Jasmin.
Commonly known as Weedy Scorpionfish, Popeyed Scorpionfish or the Purple Tassled Rhino Scorpionfish, Rhinopias frondosa (Scorpaenidae) is a spectacular fish, very rare, but once found, can be easily located again as they tend to stay at the same place unless disturbed.
The colors will vary but they’re generally in red, purple, orangish hues. The specimen shown is purple variation.
I don’t mean to “steal” this post from Mathispun, but here’s a quick caption for this cool gif. (Caption made available to you by Wikipedia and my copy and pasting skills).
A pair of parabolas face each other symmetrically: one on top and one on the bottom. Then the top parabola is rolled without slipping along the bottom one, and its successive positions are shown in the animation. Then the path traced by the vertex of the top parabola as it rolls is a roulette shown in red, which happens to be a cissoid of Diocles. In geometry, the cissoid of Diocles is a cubic plane curve notable for the property that it can be used to construct two mean proportionals to a given ratio. In particular, it can be used to double a cube. Doubling the cube (also known as the Delian problem) is one of the three most famous geometric problems unsolvable by compass and straightedge construction. It was known to the Egyptians, Greeks, and Indians. To “double the cube” means to be given a cube of some side length s and volume V = s^3, and to construct the side of a new cube, larger than the first, with volume 2V and therefore side length s * cube root 2. The problem is known to be impossible to solve with only compass and straightedge, because cube root 2 (≈ 1.25992105…) is not a constructible number.