"For this new coronavirus, we have not identified the source of the infection and we are not clear about the risk of its mutation and how it spreads. Since this is a new coronavirus there might be some changes in the coming days and weeks, and the danger it poses to people of different ages is also changing."

"Which do you think came first—the blood or the heart—and why? Did the heart in all these different species of fish, reptiles, birds, and mammals evolve before there were blood vessels throughout their…"

"Every political debate these days contains a lot about economic policies. So much so that sometimes I think people get a little tired of hearing about them. Naturally there is a cry that Government mu…"

"It's about not accepting every little challange thrown at you. Sometimes you hold back and when it's needed you go for it."

"Of all the things a man may do, sleep probably contributes most to keeping him sane. It puts brackets about each day. If you do something foolish or painful today, you get irritated if somebody mentio…"