Hydrogen, as atomic H, is the most abundant chemical element in the universe, making up 75% of normal matter by mass and over 90% by number of atoms (most of the mass of the universe, however, is not in the form of chemical-element type matter, but rather is postulated to occur as yet-undetected forms of mass such as dark matter and dark energy). This element is found in great abundance in stars and gas giant planets. Molecular clouds of H2 are associated with star formation. Hydrogen plays a vital role in powering stars through the proton-proton reaction and the CNO cycle nuclear fusion.
Clouds of H2 form what?
stars

In the US, one kilowatt-hour (3.6 MJ) of electricity currently causes an average 1.34 pounds (610 g) of CO
2 emission. Assuming the average light bulb is on for 10 hours a day, a 40-watt bulb will cause 196 pounds (89 kg) of CO
2 emission per year. The 6-watt LED equivalent will only cause 30 pounds (14 kg) of CO
2 over the same time span. A building's carbon footprint from lighting can therefore be reduced by 85% by exchanging all incandescent bulbs for new LEDs if a building previously used only incandescent bulbs.
How much CO2 emission would a 40-watt light bulb produce after 10 hours?
196 pounds

In 1969, Schwarzenegger met Barbara Outland (later Barbara Outland Baker), an English teacher he lived with until 1974. Schwarzenegger talked about Barbara in his memoir in 1977: "Basically it came down to this: she was a well-balanced woman who wanted an ordinary, solid life, and I was not a well-balanced man, and hated the very idea of ordinary life." Baker has described Schwarzenegger as "[a] joyful personality, totally charismatic, adventurous, and athletic" but claims towards the end of the relationship he became "insufferable classically conceited the world revolved around him". Baker published her memoir in 2006, entitled Arnold and Me: In the Shadow of the Austrian Oak. Although Baker, at times, painted an unflattering portrait of her former lover, Schwarzenegger actually contributed to the tell-all book with a foreword, and also met with Baker for three hours. Baker claims, for example, that she only learned of his being unfaithful after they split, and talks of a turbulent and passionate love life. Schwarzenegger has made it clear that their respective recollection of events can differ. The couple first met six to eight months after his arrival in the U.S their first date was watching the first Apollo Moon landing on television. They shared an apartment in Santa Monica for three and a half years, and having little money, would visit the beach all day, or have barbecues in the back yard. Although Baker claims that when she first met him, he had "little understanding of polite society" and she found him a turn-off, she says, "He's as much a self-made man as it's possible to be he never got encouragement from his parents, his family, his brother. He just had this huge determination to prove himself, and that was very attractive I'll go to my grave knowing Arnold loved me."
What historical event did Baker and Schwarzenegger watch on TV together on their first date?
the first Apollo Moon landing