We've tested out hotel mattresses around the globe so we can give you the low-down on which mattresses will help you catch some serious zzzâs. It doesnât matter if you stay in a cheap motel or at an uber-luxe hotel overlooking Central Park â if the mattress isnât comfortable, it can ruin your entire vacation.
Human body weight. The term human body weight is used colloquially and in the biological and medical sciences to refer to a person's mass or weight. Body weight is measured in kilograms, a measure of mass, throughout the world, although in some countries such as the United States it is measured in pounds, or as in the United Kingdom, stones and pounds.
If scientists canât count all the cells in a human body, how can they estimate it? The mean weight of a cell is 1 nanogram. For an adult man weighing 70 kilograms, simple arithmetic would lead us to conclude that that man has 70 trillion cells.