When melting snow crystals or raindrops fall through very cold air, they freeze to form small particles of ice,called sleet.

VOA: special.2010.01.05

When melting snow-crystals or raindrops fall through very cold air, they freeze to form small particles of ice, called sleet.

VOA: special.2011.01.11

The DNA particles were designed so pieces next to each other contained eighty letters that overlapped, with one placed over the other.

VOA: special.2010.07.20

The process uses electricity to help separate electrically charged salt particles from water to make it drinkable.

VOA: special.2010.04.05

Physicists use super-powerful magnets to speed particles and control radiation like X-rays.

VOA: special.2010.10.08

The devices are designed to remove dangerous particles from the air.

VOA: special.2009.07.14

These extremely small particles are believed to be linked to comets.

VOA: special.2009.01.20

If dark matter particles exist, scientists say, they should be able to observe a small amount of light given off when they hit the nucleus of a xenon atom.

VOA: special.2009.07.21

He says the next step is to develop microscopic nano-particles.

VOA: special.2010.03.16

Aviation analysts say the sharp volcanic particles can damage a jet engine or cause it to shut down in mid air.

VOA: standard.2010.04.15

The ash clouds include particles of rock, glass and sand that can get into an aircraft's engine and cause it to stall.

VOA: standard.2010.04.17

The website is overseen by a group of working physicists, but you don't need a Nobel Prize to join in the adventure of sub-atomic particles.

VOA: standard.2010.03.05

He also led a study that showed that airborne particles produced by automobile exhaust, industry and coal or oil fired power plants can cause blood pressure to rise to dangerous levels.

VOA: standard.2010.08.04

The volcano has sent a massive cloud of microscopic ash particles swirling across northern Europe - particles that air specialists say are highly abrasive and could cause aircraft engines to fail.

VOA: standard.2010.04.16