ScienceIQ.com

Drip, Drip Water Clocks

Water clocks were among the earliest timekeepers that didn't depend on the observation of celestial bodies. One of the oldest was found in the tomb of the Egyptian pharaoh Amenhotep I, buried around 1500 BCE. Later named clepsydras ('water thieves') by the Greeks, who began using them about 325 BCE, these were stone vessels with sloping sides that ...

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DripDripWaterClocks
Biology

How Does Salmonella Get Inside Chicken Eggs?

Salmonella enteritidis is a bacterium that causes flu-like symptoms in humans. It usually enters the human body through undercooked food that we eat, such as chicken eggs. Symptoms develop 12-24 hours ... Continue reading

SalmonellaChickenEggs
Geology

A River of Sand

Next time you're at the beach or in the desert, climb a sand dune in bare feet on a windy day. Stand still in various places on the gently sloping windward side. Watch how wind-driven sand grains ... Continue reading

RiverOfSand
Geology

Why Don't We Try To Destroy Tropical Cyclones?

There have been numerous techniques that we have considered over the years to modify hurricanes: seeding clouds with dry ice or Silver Iodide, cooling the ocean with cryogenic material or icebergs, ... Continue reading

TropicalCyclones
Mathematics

How To Calculate The Area Of A Right Cone

The cone is another three-dimensional shape based on the circle. You could think of it as the cross between a circle and a right triangle. Its properties will have features of both shapes, and this ... Continue reading

AreaOfARight Cone

Is the Dead Sea really dead?

IstheDeadSeareallydeadThe Dead Sea is located on the boundary between Israel and Jordan at a lowest point on earth, at 400 meters (1,320 feet) below sea level. All waters from the region, including the biggest source, the Jordan River, flow into the Dead Sea where there are hardly any outflows short of ground based sink holes and evaporation. This makes it the saltiest and most mineral-laden sea in the world.

The salt concentration is so great, (about one third of salt per weight of water), that fish introduced into the sea by the Jordan River die almost instantly. Only bacteria and halophytes (plants that grow in salty soils) survive. White salt crystals form at the bottom and on the edges of the sea. This high salinity, and hence high density of the water, makes the Dead Sea one of the greatest swimming pools in the world. Even if you don’t know how to swim, don’t worry, you will be able to effortlessly float in the Dead Sea.

The latest measurements indicate that Dead Sea may be in trouble. Namely, the surface level of the water is retreating by 3 feet (90 cm) each year. Many believe that the problem lies in insufficient volume of water flowing into it from the Jordan River due to its overuse by the urban areas. Will the Dead Sea one day be called the Dry Sea? Time will tell.