An African-American or Mexican-American senior living in a community where many neighbors share their background is less likely to have cancer or heart disease than their counterpart in a more mixed neighborhood. Results of the new study by Kimberly Alvarez, a PhD student at Columbia...
...additional time will it take? Here's the full question: A boat is floating at rest in dense fog near a large cliff. The captain sounds a horn at water level and the sound travels through the salt water and the air (340 m/s) simultaneously. The echo in the water takes 0.40 s to return. How...