Peeing in the pool is dangerous. Blue light on your phone disrupts your sleep. Exercising in the city is unhealthy. Marijn Frank, Joep van Deudekom and Tim Senders investigate what we think we know.

Plants grow better when you talk to them nicely. Rosemary oil will make your hair grow again. Your pet can make you seriously ill. What is true and what is not?

The first tear of sorrow comes from your left eye. We can bury dead people in a more environmentally friendly way. It is easy to learn to hold your breath for four minutes.

Are baby monitors a target for hackers? Can more than half of broken electrical appliances be easily repaired? And does a negative message work better to encourage people to take action?

Is it possible to bypass a breathalyser test? And is public transport wheelchair friendly?