Average rainfall 2001-2016, global tropics

Map: Average rainfall 2001-2016, global tropics

Lubrication spectroscopy

https://www.photonics.com/Articles/Smartphone_Spectroscopy_Takes_the_Lab_to_the/a63917

https://www.photonics.com/Articles/Smartphone_Spectroscopy_Takes_the_Lab_to_the/a63917