Two studies, published in Science, have found that when we sleep, the neurons in our brains prune their synapses in order to delete the memory of events not relevant to learning. That space then becomes available to store new essential memory.
h/t: THE GUARDIAN
A team of researchers has developed a new type of paper that can be reprinted more than 80 times and doesn’t require a drop of ink. When exposed to ultraviolet light, it—ordinarily, blue due to a coating of nanoparticles—turns colorless, rendering the text in blue.
The document has a shelf-life of about a week, after which it slowly fades back to a sheet of solid blue. For faster erasure, the paper can be heated to 250 degrees Fahrenheit.
A pair of Harvard researchers has turned hydrogen—a gas, in its ordinary state—into metal under colossal pressure—380 gigapascals or about 3.8 million times more pressure than is found at sea level.
h/t: ARS TECHNICA