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2 hours ago · A vaccine is a biological preparation that provides active acquired immunity to a particular infectious or malignant disease. [1] [2] The safety and effectiveness of vaccines has been widely studied and verified. [3] [4] A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or ...
1 day ago · According to the agreement of the IIHF in Malta, the 2024 World Championship is held in Czechia. Prague and Ostrava were officially announced as venues of the championship on 24 May 2019 in Bratislava. Originally, it was assumed that the World Championship would be held in Brno, as it was supposed to contribute to a new hockey hall.
- 10–26 May
- 2 (in 2 host cities)
- 16
- Czechia
1 day ago · The 1984 World Sportscar Championship season was the 32nd season of FIA "World Sportscar Championship" motor racing. It featured the 1984 FIA World Endurance Championship, which was open to FIA Group C1, Group C2 and Group B cars and to IMSA GTP, GTX, GTO and GTU cars. [1] The championship was contested over an eleven race series which ran from ...
1 day ago · Operation Barbarossa (German: Unternehmen Barbarossa; Russian: Операция Барбаросса, romanized: Operatsiya Barbarossa) was the invasion of the Soviet Union by Nazi Germany and many of its Axis allies, starting on Sunday, 22 June 1941, during the Second World War. It was the largest and costliest land offensive in human history ...
- 22 June 1941 – 7 January 1942, (6 months, 2 weeks and 2 days)
- Axis captured approximately 600,000 square kilometres of Soviet territory but failed to reach the A-A line
- Soviet Victory, Axis operational failure
1 day ago · Fleas, as a group, are quite old (most flea families formed around the end of the Cretaceous), but no analyses have provided estimates for the age of the flea lineages associated with bats. The oldest known members of a different lineage of bat ectoparasites ( bat flies ), however, are from roughly 20 mya, well after the origin of bats. [23]
- Eukaryota
- Chiroptera, Blumenbach, 1779
1 day ago · The Köppen climate classification is one of the most widely used climate classification systems. It was first published by German-Russian climatologist Wladimir Köppen (1846–1940) in 1884, [1] [2] with several later modifications by Köppen, notably in 1918 and 1936. [3] [4] Later, German climatologist Rudolf Geiger (1894–1981) introduced ...
1 day ago · Epigenetics. Epigenetic mechanisms. In biology, epigenetics is the study of heritable traits, or a stable change of cell function, that happen without changes to the DNA sequence. [1] The Greek prefix epi- ( ἐπι- "over, outside of, around") in epigenetics implies features that are "on top of" or "in addition to" the traditional (DNA ...
