Here is another fake viral science experiment that was floating online for a while. Can we really turn a glass upside down so that water stays in the glass? This trick uses a bit of real science, making it harder to understand where the real science finishes and the fake one begins. Air molecules are constantly pushing into things creating a pressure of about 1 kg per square centimetre. That is enough pressure to hold a card under the water glass in place. The weight of water in my glass is only