Tag: science & technology

James Chadwick discovered the neutron in 1932. The neutron is a chargeless (neutral) and massive subatomic particle found in atomic nuclei. J.J. Thompson discovered the electron, and John Dalton proposed atomic theory.

Blaise Pascal invented the Pascaline in 1642, an early mechanical calculator that could perform addition and subtraction. It was one of the first calculating machines and used a geared wheel mechanism. His work laid groundwork for future computing devices.

Baking soda's chemical name is sodium bicarbonate (NaHCO3), a white crystalline compound used as a leavening agent in baking. Sodium carbonate is washing soda, while sodium chloride is table salt. The bicarbonate releases CO2 when heated, causing dough to rise.

László Bíró, a Hungarian journalist, patented the first successful ballpoint pen in 1938. The design used a tiny ball that rolled to distribute ink as it moved across paper. His brother György, a chemist, helped develop the viscous ink formula that didn't smudge.

William Harvey demonstrated in 1628 that blood circulates continuously through the body, pumped by the heart. His work 'De Motu Cordis' overturned the prevailing Galenic theory. Edward Jenner developed smallpox vaccine, while Joseph Lister pioneered antiseptic surgery.

Diamond is pure crystalline carbon, where each carbon atom is bonded tetrahedrally to four others in a giant covalent structure. This arrangement gives diamond its exceptional hardness. Graphite is also pure carbon but with a different layered structure.

Carl Linnaeus developed the system of binomial nomenclature (Genus species) that we still use today to name organisms. His 1753 work 'Species Plantarum' established the hierarchical classification system (Kingdom, Phylum, Class, Order, Family, Genus, Species). This standardized biological taxonomy worldwide.

Herbivores are animals that consume only plant material. Carnivores eat meat, omnivores eat both plants and animals, and 'vegetarian' is a dietary choice for humans, not a biological classification for animals.

Tigers are native to Asia, found in countries like India, Bangladesh, Nepal, Bhutan, China, and Southeast Asia. They are not found in Africa, South America, or Australia.

The giant squid has the largest eyes of any animal, up to 10 inches in diameter, about 10 times larger than human eyes. This helps them see in the deep, dark ocean where they live.