Astronomy

In 2004, European scientists launched Rosetta in an effort to land on what space object 10 years later?

A comet
http://www.esa.int/Our_Activities/Space_Science/Rosetta/The_long_trek

Holidays

In 1870, what U.S. president officially declared December 25 as a federal holiday?

Ulysses S. Grant
http://en.wikipedia.org/wiki/Federal_holidays_in_the_United_States

Holidays

In 1939, what Christmas character was created by a Jewish man, Robert L. May?

Rudolph the Red-nosed Reindeer
http://en.wikipedia.org/wiki/Robert_L._May

World History

What region of the world started hanging Christmas trees upside down as early as the 12th century?

Eastern Europe
http://easteuropeanfood.about.com/od/christmaseve/a/Upside-Down-Christmas-Trees.htm

Biology

Xenophyophores are the largest known single-cell organisms in the world. Living on the ocean floor, about how many centimeters in diameter can they get?

20 cm
http://en.wikipedia.org/wiki/Xenophyophore

U.S. History

Clement Clarke Moore first published his most famous poem anonymously, but it has arguably had more influence on the world than any other poem written by an American. What poem did he write?

'Twas the Night Before Christmas
http://en.wikipedia.org/wiki/Clement_Clarke_Moore

Holidays

Many British Commonwealth nations (Canada, UK, Australia, etc.) celebrate Boxing Day on December 26. What is the purpose of Boxing Day?

Employers give gifts or bonuses to their employees
http://en.wikipedia.org/wiki/Boxing_Day

Chemistry

PVC is the third most widely produced plastic, and can be found everywhere from sewer pipes to fake Christmas trees. What does PVC stand for?

Polyvinyl chloride
http://en.wikipedia.org/wiki/Polyvinyl_chloride

General Knowledge

What does the "CE" button on the calculator stand for?

Clear Entry
http://www.ask.com/question/what-do-the-buttons-on-calculators-mean