Dead or depleted batteries, especially cylindrical ones like AA or AAA batteries, can exhibit a unique behavior known as "bouncing" when dropped from a short height. This phenomenon is primarily due to changes in the battery's internal chemistry and physical properties as it becomes discharged.

Inside a battery, there are chemical reactions that generate electrical energy. As a battery discharges and its chemical energy is depleted, its internal chemistry changes. One of the changes that occur is a reduction in the pressure of gases within the battery. This decrease in gas pressure can make the battery feel lighter, contributing to its bounce.

As a battery discharges, its internal components, such as the cathode, anode, and electrolyte, unde ...

This is bismuth, a brittle metal with a white or silver-pink hue and an iridescent oxide tarnish that produces a rainbow of colours from yellow to blue. It is the most naturally diamagnetic metal in the world, which means it can create a magnetic field in opposition to an externally applied magnetic field. ...

A panel of respected physicians has written a major paper advising the public against 'wasting money' on multivitamins. Their report analysed 27 clinical studies: "We believe that the case is closed — supplementing the diet of well-nourished adults with (most) mineral or vitamin supplements has no clear benefit and might even be harmful. These vitamins should not be used for chronic disease prevention. Enough is enough."

Source:

https://annals.org/aim/fullarticle/1789253/enough-enough-stop-wasting-money-vitamin-mineral-supplements ...

A new study has found that oxytocin alters anorexic patients' tendencies to fixate on images of high calorie foods and larger body shapes. The research presents a possible pathway for future treatments of anorexia nervosa, which has one of the highest mortality rates of all mental illnesses.

Reference: http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0090721 ...

This incredible video proves that helium isn't just a voice-raising gas. In its superfluid state it also defies gravity, has zero friction and can leak through glass.