Is the Earth's Shape Changing

The changing shape of a medical college.

Cell Signalling: Changing Shape Changes the Signal

Recent experiments have revealed the existence of subcellular gradients of signalling molecules. A new modelling study shows that changes in cell shape or size allow gradient-controlled pathways to be turned on or off simply by altering the distance between the signal source and targets.

the effects of changing roughness on the flow structure in the bends

flow in natural river bends is a complex and turbulent phenomenon which affects the scour and sedimentations and causes an irregular bed topography on the bed. for the reason, the flow hydralics and the parameters which affect the flow to be studied and understand. in this study the effect of bed and wall roughness using the software fluent discussed in a sharp 90-degree flume bend with 40.3cm ...

The Arctic is changing

The two earths of Eratosthenes.

In the third century B.C.E., Eratosthenes of Cyrene made a famous measurement of the circumference of the Earth. This was not the first such measurement, but it is the earliest for which significant details are preserved. Cleomedes gives a short account of Eratosthenes' method, his numerical assumptions, and the final result of 250,000 stades. However, many ancient sources attribute to Eratosth...