A mysterious large mass of material has been discovered beneath the Moon's South Pole-Aitken basin, the largest crater in our solar system.

The crater, thought to have been created about 4 billion years ago, is oval-shaped and as wide as 2,000 kilometers (roughly the distance between Waco, Texas, and Washington, D.C.) and several miles deep. Despite its size, it cannot be seen from Earth because it is on the far side of the Moon. 

In a new survey, 80 percent of gun owners support the concept of personalized guns, referred to as "smart" guns because they include safety features like fingerprint locks to help prevent use by unauthorized individuals. But only 18 percent are willing to buy them.

People who smoke marijuana and are considering having children in the future need to be aware about four serious issues that may impact both men and women according to an article ("Five things to know about ... marijuana and fertility" - the title says five things, but there are only four, the fifth is a plea to send more money) in CMAJ (Canadian Medical Association Journal).

The following is useful information for people who may want to conceive. 

Four things to know about marijuana and fertility:

Scientists continue to gain ground in the race against wheat stem rust, a pathogen that threatens global food security because of its ability to kill wheat. The new chink in nature's armor was discovered in the first rust virulence molecule that wheat plants detect to 'switch on' built-in resistance and stave off the disease.

Dog owners insist that 'all dogs are puppies', which means our beliefs about their cuteness are not conditional on age, but a paper in Anthrozoos: A Multidisciplinary Journal of the Interactions of People and Animals, suggests otherwise. The authors found that dogs' attractiveness to humans peaks at roughly eight weeks, the same point in time at which their mother weans them and leaves them to fend for themselves.

To many in the west, Siberia is synonymous with remote winter gulags where dissidents go to die. A new simulation estimates that if climate change occurs according to more aggressive models, the end of the century might see it as a pretty nice place to love. Russia east of the Urals towards the Pacific accounts for 77 percent of Russia's land area - 13 million square kilometers. Its population, however, is just 27 percent and is concentrated along the forest-steppe in the south, which has a comfortable climate and fertile soil.