Justin Bieber was born March 1, 1994 and grew up in Stratford, Ontario, Canada. Justin Bieber is 23 years old. At the age of 12 he entered a local singing competition against others who had significantly more experience and the benefit of vocal coaches. Justin Bieber came in second place singing Ne-Yo's So Sick..
Platelet. An irregularly shaped cell-like particle in the blood that is an important part of blood clotting. Platelets are activated when an injury causes a blood vessel to break. They change shape from round to spiny, sticking to the broken vessel wall and to each other to begin the clotting process.
Platelets (also called thrombocytes) are tiny oval-shaped cells made in the bone marrow. They help in the clotting process. When a blood vessel breaks, platelets gather in the area and help seal off the leak. Platelets survive only about 9 days in the bloodstream and are constantly being replaced by new cells.