Answer:
a human can stay up to 79 years
<span>Any type of pharmaceutical product or dietary supplement must be tested in clinical trials before they can be marketed in order to assess their safety for the general public's consumption and to confirm their intended purpose. While not a complete fail safe, these tests intend to prove a reasonable sense of safety for the product.</span>
The sewing needle should float in the water if placed on a horizontal angle if I remember properly.
I hope this helps in some way.
I believe it is called the cardiac muscle.
