We are used to heat flowing from hot objects to cool ones, and never the other way round, but now researchers have found it is possible to pull off this trick in the strange realm of quantum mechanics ...

There are many different principles on which to draw in moral reasoning about specific environmental problems. This lesson reviews three basic pairs of principles: justice and sustainability; ...

Using gold flakes, salt water, and light, scientists have made the universe’s invisible binding forces visible in color. The discovery opens new possibilities for studying how matter organizes itself ...

Basic economy seats come with cheaper fares, but seat selection and baggage is limited and varies between airlines. Many or all of the products on this page are from partners who compensate us when ...

IN a lecture delivered to the Physical and Chemical Society of University College, Nottingham, on February 4, Prof. E. Schrödinger directed attention to the difficulties and contradictions which arise ...

Calculate whether the low-price basic economy fare is worth the hassle of less cancellation flexibility. Many or all of the products on this page are from partners who compensate us when you click to ...