For hundreds of years alchemists toiled in their laboratories to produce a mythical substance known as the philosopher’s stone.
The supposedly dense, waxy, red material was said to enable the process that has become synonymous with alchemy— the metamorphosis, or transmutation, of base metals such as lead into gold.
Yet supermarkets sell a lot of chilled meals that include rice and these can have "use by" dates up to a week away.
What is different about the cooked rice in these meals?
For us Americans, this will be the first total eclipse of the sun viewable in the states since 1979.
So we don’t have to fly half way around the world to see a total eclipse as astronomer Guillermo Gonzalez did in 1995, flying to Northern India to see the eclipse on October 24th of that year.
The stable form of carbon is carbon 12 and the radioactive isotope carbon 14 decays over time into nitrogen 14 and other particles.
I have seen this advice before, saying it is not safe to keep cooked rice for more than a short time, even in the fridge.If you have a fossil, you can tell how old it is by the carbon 14 dating method.This is a formula which helps you to date a fossil by its carbon.The OCO-2 mission represents an important advance in the ability to observe atmospheric carbon dioxide.OCO-2 collects high-precision, total column measurements of carbon dioxide (from the sensor to Earth’s surface) during daylight conditions.