SAT R&W 91: Mixed Module Practice 2 — Information and Ideas Under Time

A bicycle wheel stays upright not because of the spinning mass, as is usually said, but because of how the front fork is angled. Wheels built with counter-rotating discs, which cancel the spinning effect entirely, still balance and steer. Wheels with the fork angle reversed fall over at once, whatever the spin. The effect that gets the credit and the effect that does the work are not the same one.

A species of ant farms a fungus and feeds it cut leaves. The fungus produces small nutrient-rich bodies that the ants eat, and it produces them only where ants are grazing. Fungi of the same genus growing without ants produce none. Since the bodies cost the fungus energy and are of no use to it, their production

A bakery cut the number of loaves it baked each week after its owner concluded that too many were going to waste. She reported afterwards that the change had reduced waste not only in total but as a share of what she produced:

While studying a story about a man who has returned to sea after twenty years ashore, a student has written the following claim:

Rashid discovers that the skill he expected to have lost is the one thing that has stayed with him.

Glass eels arriving on a European coast each spring have crossed the Atlantic from a spawning area thousands of kilometres away. Numbers arriving have fallen sharply since the 1980s. Researchers proposed that the fall is caused by changes in the ocean current the larvae drift on, which would lengthen the crossing beyond what their energy reserves allow.

The reading room's rule against bringing in bags was introduced to prevent theft, and the manuscripts have not been stolen since. Readers now carry their notes in loose sheets, and the librarians report that loose sheets are left behind, mixed into volumes and occasionally shelved inside them. Nothing has been taken from the collection; things have been added to it.