When you've nailed your makeup look, the last thing you need is for it to melt away within a few hours. That's where makeup primer comes into play. The best ones not only keep your look in place all ...
The organs of a body are a spatial division of labour, one created by different genes being turned on or off in different cells. The same process serves to give individual lives a division of labour ...
The chemical reactions on which life depends need a place to happen. That place is the cell. All the things which biology recognises as indisputably alive are either cells or conglomerations of cells ...