Because blood from different individuals may different in the type of antigen on the surface of the red cells and the type of antibody in the plasma, a dangerous reaction can occur between the donor and recipient in a blood transfusion.

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.

The deadbolt is the best lock for entry doors because it is not only inexpensive but utallation is easy.

When mining for gold, you must first obtain the gold ore and then apart the gold from the ore.

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.