It always starts with evaporation, because without water vapor (the byproduct of evaporation), there would be no clouds (they are made out of water vapor and some other particles). Henceforth, there will be no rain.
Colored sesame seeds are neutrons and plain sesame seeds are protrons.
Explanation:
The human erythrocyte adopts a distinctive biconcave disc form in vivo. ... It has been suggested that this shape maximises the surface area to volume ratio and thus expedites diffusion.
