The developing of the submarine was hindered by the lack of a power source that could propel an underwater vessel

Mercury and alcohol are widely used in thermometers because their volume increases uniform with temperature.

The Commitments of Traders Report is released by the Commodity Futures Trading Commission on eleventh day of each month.

These snakes will not cause you any serious harm. They are harmful.

Ours brains are incredibly agile machines, and it's hard to think of anything they do more efficient than recognize face.

A beaver uses its strong front_teeth to cut down trees and peel_off its bark.

The clerks who are happy to wait for their customer will get promoted soon.

The eastern bluebird is considered the most attractive bird native of North America by many bird-watchers.