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How do plasma balls work?

This question was asked by Hollie from Plymouth, UK.  Plasma is sometimes known as the fourth state of matter; it…

Hair comes in many gorgeous shades and styles. (Image: Eddy Van 3000).

Why do humans have hair?

This question was asked by Immy from Mersey Vale school, Stockport, UK.  Millions of years ago our ancestors were covered…

The Andromeda galaxy, as seen by the Hubble telescope. (Image: NASA/JPL-Caltech).

What is Galaxy Zoo?

In some areas of scientific study, producing data isn’t a problem; it’s analysing it all that can be difficult. Astronomy…

(Image: Quinn Dombrowski)

Why do we get goosebumps?

This question was asked by Pauline from Edinburgh, UK.  Goosebumps, also known as goose pimples or goose flesh, are called…

(Image: AL.Eyad)

What is the placebo effect?

Put simply, a placebo is something that seems to be a medical treatment but isn’t. Sugar pills are one of…