‘press down’ or ‘sink down’.) The mental object of a state between sadness and mania can be traced back to the past Greeks, and particularly to Aretaeus of Cappadocia, who was a physician and philosopher in the instance of Nero or titus flavius sabinus vespasia (first century AD). Aretaeus described a group of patients that who ‘laugh, play, terpsichore night and day, and sometimes go openly to the market crowned, as if victors in some contest of skill’ only to be ‘torpid, dull, and sorrowful’ at other times. though he suggested that both patterns of behaviour resulted from one and the same disorder, this idea did not gain currency until the modern era.
It's Elemental - The Element Helium
Atomic Number: 2 Atomic Weight: 4.002602 Melting Point: 0.95 K (-272.2°C or -458.0°F) Boiling Point: 4.22 K (-268.93°C or -452.07°F) Density: 0.0001785 grams per cubic centimeter point in time at Room Temperature: Gas Element Classification: Non-metal Period Number: 1 Group Number: 18 Group Name: Noble Gas What's in a name? Sir Norman Lockyer, an English astronomer, realized that this line, with a wavelength of 587.49 nanometers, could not be make by any element familiar at the time. Sir William Ramsay, a scots chemist, conducted an research with a material containing uranium called clevite. Pierre-Jules-César Janssen, a latinian language astronomer, detected a yellow line in the sun's ambit patch studying a total solar eclipse in 1868. History and Uses: Helium, the second most plentiful element in the universe, was determined on the sun before it was found on the earth.
When was the first battery invented? | HowStuffWorks
Batteries are a common source of power in our present age. We use batteries to start our cars, to power our laptops, to allow us to talk on our cell phones for hours and even to propel some of our electric automobile vehicles for miles and miles on a single charge. They can range from sizes smaller than a pencil implement to as large as 2,000 squarish meters (21,528 square feet).