Out of 4,379 worker fatalities in private industry in calendar year 2015, 937 or % were in construction — that is, one in five worker deaths last year were in construction. The leading causes of private sector worker deaths (excluding highway collisions) in the construction industry were falls, followed by struck by object, electrocution, and caught-in/between. These "Fatal Four" were responsible for more than half (%) the construction worker deaths in 2015 , BLS reports. Eliminating the Fatal Four would save 602 workers' lives in America every year .
Both of the sets of natural numbers defined above are denumerable. They are also exactly the same size. It's not difficult to prove this; their elements can be paired off one-to-one, with no elements being left out of either set. In infinite sets, the existence of a one-to-one correspondence is the litmus test for determining cardinality , or size. The set of integers and the set of rational numbers has the same cardinality as N . However, the sets of real numbers, imaginary numbers, and complex numbers have cardinality larger than that of N .
“etaoin shrdlu” (eh-tay-oh-in shird-loo), was believed to be the twelve most common letters in the English language. The word came from linotype typesetting machines. The first, left row of six keys on a linotype machine produce the word “etaoin”. The second, left row of six keys produce the word “shrdlu”. The linotype machine keys are labeled: etaoin-shrdlu-cmfgyp-wbvkxj-qz”. The letter ‘h’ appears more often in every day speech and writing than it does in a list of dictionary words. The first twelve letters “e t a o i n s r h l d c”, are found in around 80% of the words in the English language.