Tag: science & technology

Water is one of the few liquids that expands when it freezes due to hydrogen bonding forming an open hexagonal crystal structure with more volume than liquid water. This unusual property explains why ice floats and why pipes can burst in winter. Mercury, liquid nitrogen, and mineral oil all contract upon freezing like most liquids.

Koala bears have fingerprints remarkably similar to human fingerprints, with distinct patterns of ridges and whorls. This is an evolutionary adaptation for gripping eucalyptus branches while climbing. Cats have paw pads with different patterns, squirrels have non-finger grip pads, and parrots have scaled feet without fingerprints.

Water is one of the few substances that expands when it freezes. This occurs because the hydrogen bonds form a crystalline hexagonal lattice in ice that is less dense than liquid water. Mercury and oils typically contract when transitioning from liquid to solid.

Mosquitoes can walk on water due to surface tension - the cohesive forces between water molecules creating a 'skin' that supports their light weight. Their leg oils and tiny foot weight distribution enhance this effect. Buoyancy helps floating objects, viscosity affects fluid flow resistance, and capillarity involves liquid rise in narrow tubes, but only surface tension explains walking on water.

Water is one of the few liquids that expands when it freezes due to hydrogen bonding forming an open hexagonal crystal structure with more volume than liquid water. This unusual property explains why ice floats and why pipes can burst in winter. Mercury, liquid nitrogen, and mineral oil all contract upon freezing like most liquids.

Koala bears have fingerprints remarkably similar to human fingerprints, with distinct patterns of ridges and whorls. This is an evolutionary adaptation for gripping eucalyptus branches while climbing. Cats have paw pads with different patterns, squirrels have non-finger grip pads, and parrots have scaled feet without fingerprints.

Surface tension creates a thin 'skin' on water due to cohesive forces between water molecules at the surface. Mosquitoes are lightweight and their legs distribute weight over a large area, preventing them from breaking this surface layer. Buoyancy would require displacing water, which mosquitoes do not do when floating.

Shiv Nadar, founder of HCL Technologies, hails from Moolaipozhi village in Tirunelveli district of Tamil Nadu. He established the SSN Trust in 1994 to develop educational institutions in India and received the Padma Bhushan in 2008 for his contributions to IT industry and education.

Radiometric dating techniques like carbon dating use the predictable decay of radioactive isotopes to determine the age of organic fossils. By measuring the remaining radioactive material in a fossil and comparing it to the known half-life, scientists can calculate how long ago the organism died.

Agilent Technologies was spun off from HP in 1999 as a separate company focused on test and measurement, healthcare, and chemical analysis. The company inherited HP's non-computer businesses including electronic test equipment, scientific instruments, and semiconductor products. Cisco, APC, and Symbiosis were unrelated entities.