In an age when misinformation, alternative facts, and conspiracy theories have become mainstream, UFOs have risen to become one of the most-talked about pop culture phenomena. With all of this noise, how can we expect anyone to know how much of this is true? What is in our skies? What do we know, and how do we know it? And most importantly: Are we being visited?
Geometry Part 2 goes into detail on perimeter, circumference and area for 2-dimensional and 3-dimens...
Revised 1998 version. Beginning with a review of functions and graphing, Part 1 jumps into the world...
Aspiring teenage astronauts reveal that a journey to Mars is closer than you think.
EVERYTHING YOU NEED TO KNOW TO ACE PRE-CALCULUS IS AT YOUR FINGERTIPS: functions, polynomials, f(x),...
Explores the unprecedented bipartisan congressional effort to uncover what intelligence agencies rea...
The captivating tales of the people and events behind one of humanity's greatest achievements in exp...
On a late summer evening in 1977, Ohio radio astronomers discovered a strong, interstellar signal th...
Laika, a stray dog, was the first living being to be sent into space and thus to a certain death. A ...
The documentary's title translates as "to be and to have", the two auxiliary verbs in the French lan...
This edition includes topics such as exponential functions, common log or base 10, rules of exponent...
National Geographic's riveting effort recounts all 12 crewed missions using only archival footage, p...
On July 16, 1969, hundreds of thousands of spectators and an army of reporters gathered at Cape Kenn...
A real-time reconstruction of time-lapse photographs taken on board the International Space Station ...
A group of uniformed Japanese schoolchildren make their way to class. But what they will be taught w...
For years, the US government denied investigating UFOs but when an ultra-secret Pentagon program to ...
In American Sign Language (ASL) with subtitles available in English, Spanish and Canadian French. T...
During the 70s, top scientists and astronomers sent coded messages into space with the hopes of gett...
Declassified documents from the Cold War shine light into the hidden communications between the US a...
Can Homo sapiens evolve into Homo spatius? For over 50 years now, we have been testing our human nat...