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Featured Questions

Ed from Kyiv, asks

Against the black plastic on my TV, dust looks white; when I wipe it off with a white tissue,...

This is an example of what's known as simultaneous contrast. It happens both in cases like...

Jessie Meyers from Sydney, asks

Why does lemon prevent the browning of apples? When browning of apples is caused by a reaction...

Apples (and other fruits and vegetables) have within their cells enzymes and other chemicals...

Tamara Bain from Edmonton, asks

My brother and I have a very important bet and it is about the following: If you remove the...

A problem with your bet is that the proposed idea of stripping electrons from atoms is quite...