The question of eating only plant food is still debated, in particular because of the risks of deficiencies it causes. As vitamin B12, an essential nutrient, is mainly found in proteins of animal origin, i.e., meat, fish, milk and eggs, questions are raised as to whether a vegetarian or vegan diet can provide complete nourishment. If not, is taking dietary supplements the only solution? What is vitamin B12? Vitamin B12 belongs to the family of...

The genetic identity of a new virus has never been deciphered so quickly. On 29 December 2019, the first cases of an epidemic caused by a new virus were made public in China; seven days later, a team from Fudan University in Shanghai released the complete sequence of the CoV family of viruses. Since then, the sequencing of its variants has accumulated on the nextstrain.org site with more than 146 identifications by teams from 20 countries....