Sunspots 914

Things I have recently spotted that may be of interest to others*:

The Arts: NPR has posted on the wildlife comedy photo awards. Worth seeing!

Christianity: A Christianity Today article examines the effect of  reading the Bible on a device, rather than from a book.

Reader's Digest tells us why red and green colors are symbolic of Christmas. (They mention some other colors, too.)

Computing: Gizmodo reports that Elon Musk now wants employees to sleep at the office.

Politics: NPR reports that nearly a million people became US citizens in the past year.

Science: NPR reports on a 190-year-old tortoise.

2.4 million year-old DNA has been used to determine what organisms lived in the locale where it was deposited, according to an article in The Scientist.

NPR reports on a new type of treatment for cancer, using gene editing.

When I was in college, over 5 decades ago, there was discussion of using atomic fusion (the sun, and Hydrogen bombs, use this) for power generation, but a drawback was that it took more energy than it released. That has been licked, apparently, according to NPR, but we are still a long way from using fusion as a power source.

*I try not to include items that require a password or fee to view.

Thanks for reading.

I'm thankful for nuclear fusion

I’m thankful for nuclear fusion, the process by which the sun, and other stars, transform mass into energy. In the sun’s case, this is through 4 Hydrogen nuclei (protons) fusing into a Helium nucleus. About 0.7% of the mass involved is turned into energy. The reaction is not going on very fast. Scientists estimate that, at present rates, it would take about 10 billion years to exhaust the sun’s supply of Hydrogen. To put it another way, a human body at rest gives off more energy than the same volume of the sun’s material does. But the sun is so large that it gives off enough energy to heat our planet, over 90 million miles from it, losing about 5 million tons of mass per second. (Most of the sun’s energy goes out into space without striking anything in the solar system.) Without nuclear fusion, we wouldn’t be here. Our planet would be frozen, and there would be no light for green plants to convert to food. Although I’m very thankful for nuclear fusion, I’m sorry that we have, sort of, harnessed nuclear fusion, and that Hydrogen bombs exist.

See here for my main reference. Thanks for reading!