Psychology & Psychiatry

Not all women who freeze their eggs want to have children

Since the development of ultra-rapid egg freezing around 2013, more and more women worldwide are choosing to undergo the procedure. In the UK, egg freezing has increased by 240% in recent years, from 569 completed cycles ...

Diseases, Conditions, Syndromes

Virus claims record dead but Trump sees light at end of tunnel

The coronavirus pandemic notched up another round of record death tolls in the United States and Europe, dousing the optimism of US President Donald Trump who insisted there was light at the end of the tunnel.

Health

Blood donors needed as cold weather freezes U.S. supply

(HealthDay)—The U.S. blood supply is expected to drop to dangerously low levels as sub-zero weather in many parts of the country forces cancellation of crucial blood drives, American Red Cross officials warn.

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Freezing

Freezing or solidification is a phase change in which a liquid turns into a solid when its temperature is lowered below its freezing point. The reverse process is melting.

All known liquids, except liquid helium, freeze when the temperature is lowered enough. Liquid helium remains liquid at atmospheric pressure even at absolute zero, and can be solidified only under pressure. For most substances, the melting and freezing points are the same temperature; however, certain substances possess differing solid–liquid transition temperatures. For example, agar displays a hysteresis in its melting and freezing temperatures. It melts at 85 °C (185 °F) and solidifies from 31 °C to 40 °C (89.6 °F to 104 °F).

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