Scientists have developed a new type of optical disc that can increase information storage capacity to the “petabit” level — 125 terabytes of data, or the combined storage capacity of about 15,000 DVDs. Optical discs, such as DVDs and Blu-ray discs, are durable and inexpensive. A standard single-layer Blu-ray disc can store 25 gigabytes. By … Read more
You’re walking somewhere you’ve never been before and suddenly feel as though you’ve strolled down the same road already. You’re experiencing the well-known phenomenon déjà vu — but what is déjà vu, really, and why does the strange feeling happen? Déjà vu is a French expression meaning “already seen,” which was first used in 1876 … Read more
A man in his 80s gradually started feeling that he was witnessing the same events again and again. This disturbing symptom, somewhat reminiscent of the 1993 movie “Groundhog Day,” likely emerged as a rare complication of Alzheimer’s disease, according to a new report of the case. According to the report, published May 16 in the … Read more
The “secret code” the brain uses to create a key type of memory has finally been cracked. This type of memory, called working memory, is what allows people to temporarily hold on to and manipulate information for short periods of time. You use working memory, for example, when you look up a phone number and … Read more
