Tag: science & technology

When you face a rainbow, the sun is always behind you. Rainbows form when sunlight is refracted and reflected in raindrops in front of you while the sun shines from behind, creating the visible spectrum at an angle of approximately 42 degrees from the antisolar point.

Proxima Centauri is the closest known star to Earth at approximately 4.24 light-years away. It is part of the Alpha Centauri triple star system and is a red dwarf star, making it dimmer than the other options despite its proximity.

The mean free path is the average distance a molecule or atom travels between successive collisions with other particles. This concept is fundamental in kinetic theory of gases and helps explain properties like viscosity, thermal conductivity, and diffusion rates.

The spleen is called the 'blood bank' of the human body because it stores red blood cells and platelets, releasing them during emergencies like hemorrhage or shock. The spleen also filters old or damaged blood cells and plays a role in immune function.

Bonsai is the Japanese art form of growing dwarf trees or woody plants in containers. Using techniques like pruning, wiring, and root restriction, bonsai artists create miniature versions of full-sized trees while maintaining their aesthetic proportions. It requires patience and skill to maintain these living art pieces.

The Big Bang theory is the most widely accepted cosmological model explaining the origin of the universe. It describes how the universe began from an extremely hot and dense point approximately 13.8 billion years ago and has been expanding ever since. This theory is supported by evidence like cosmic microwave background radiation and redshift of distant galaxies.

Tendons are tough bands of connective tissue that connect muscles to bones, transmitting the force generated by muscles to move the skeleton. Unlike ligaments (which connect bones to other bones) or cartilage (which cushions joints), tendons specifically enable muscle contraction to produce movement. This is fundamental to how we move.

No modern bird species possesses teeth; they all have beaks instead. While some prehistoric birds like Archaeopteryx had teeth, all living birds are toothless and have evolved beaks for feeding. Birds still have claws (like in ostriches), a sense of smell, and hearing - making teeth the correct answer.

Igneous rocks are formed through the cooling and solidification of molten magma (underground) or lava (on the surface). This distinguishes them from sedimentary rocks (formed from compressed sediments) and metamorphic rocks (formed from existing rocks under heat and pressure). Examples include granite and basalt.