Conservation is the safeguarding and preservation of nature resourc es.

For the first time in the history of the country, the person which was recommended by the president to replace a retiring justice on the Supreme Court is a woman.

Working provide people with personal satisfaction as well as money.

The Greek historian Herodotus reported that one hundred thousand men are employed for twenty years to build the Great Pyramid at Gizeh.

How much times did Rich and Jennifer have to do the experiment ?

When many of my friends take a shower in the morning, I usually take one before bed.

Unless there had been a heavy storm, the climbers will not have died.

When a patient's blood pressure is much higher than it should be, a doctor usually insists that he will not smoke.