The following essay is reprinted with permission from The Conversation, an online publication covering the latest research. Those Transportation Security Administration requirements are drilled into ...

Capillary action drives many processes, such as the wetting of hairs on a paint brush and eyes tearing up. It enables the flow of liquid in small spaces — in the gaps between fibres in a paper towel, ...

Water makes up around 60% of the human body. More than half of this water is inside the cells that make up organs and tissues, and much of the remaining water flows in the spaces between cells. MIT ...