Iron filings responding to a magnetic field. Or pilgrimage to Mecca, depending on your world view.

(Source: fy-perspectives)

(Source: great-gif)

coolsciencegifs:

LED Light in Liquid Nitrogen
 When an LED is immersed in liquid nitrogen, the electrons lose a lot of thermal energy, even when the light isn’t turned on. When this happens, the bandgap in the semiconductors increases. Since this gap is increased, when electrons in the conduction band fall to the valence band, they emit a higher energy light, meaning the light emitted has a shorter wavelength and a higher frequency. This is why we see the orange light turn into colours that are higher on the electromagnetic spectrum when it is frozen in the liquid nitrogen.source

coolsciencegifs:

LED Light in Liquid Nitrogen

 When an LED is immersed in liquid nitrogen, the electrons lose a lot of thermal energy, even when the light isn’t turned on. When this happens, the bandgap in the semiconductors increases. Since this gap is increased, when electrons in the conduction band fall to the valence band, they emit a higher energy light, meaning the light emitted has a shorter wavelength and a higher frequency. This is why we see the orange light turn into colours that are higher on the electromagnetic spectrum when it is frozen in the liquid nitrogen.

source

Mayim Bialik, PhD - neuroscientist

(Source: thatssoscience)