What is this tiny object?

It's a tiny sand dollar!
What gas was the Hindenburg airship filled with?
The airship was designed to be filled with helium gas, but because of a US export restriction on helium, it was filled with highly-flammable hydrogen.
In what country is this valley of waterfalls?

Switzerland!
Who is the longest-lived president, the longest-retired president, the first president to live forty years after their inauguration, and the first to reach the age of 95? (Hint: it's one person!)
Jimmy Carter

What is the most numerous color in a two-pound bag of M&Ms?
Light red!

What did the crew of the SS Californian think of the flares sent up by the Titanic as she sank?
They mistook them for celebratory fireworks, flares sent up to light the way ahead, or fireworks used to communicate between ships of the same line.

In what country is there a beach with sand made red by ochre in the soil?

Iran, on Hormuz Island
In Singapore, everyone is automatically registered as an organ donor at the age of 21. What is the consequence of opting out?
Should you end up needing an organ, you're bumped to the bottom of the priority list.
Reindeer eyeballs change color in the winter to let in more light. What color do they become?
Blue!

In 1999, the Mars Climate Orbiter disintegrated in Mars’ upper atmosphere due to a miscommunication between NASA and Lockheed Martin about what?
Units of measurement. One used the metric units of newton-seconds, while the other used pound-seconds.

This is the largest species of eagle. What is it called?

The Harpy Eagle
The ashes of Stephen Hawking were buried between the graves of Isaac Newton and Charles Darwin in which famous church?
In Westminster Abbey, in a section known as the "Scientists Corner."
