Why are there no animals with three legs?

If "Why?" is the first question in science, "Why not?" must be a close second. Sometimes it's worth thinking about why something does not exist.

Can flipping coins replace animal experiments?

Instead of repeating an experiment in a mouse model of disease in their laboratory, researchers in Berlin, Germany used a coin toss to confirm whether a drug protects the brain against a stroke, as reported in their paper ...

A chip with blood vessels

Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.

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