If Earth formed on January 1 and the present falls at the end of December 31, when did life appear? What about humans and the Internet?
Answer 10 questions. Each answer reveals the scientific dating, its calendar position and a source. Questions use a 365-day model, an Earth age of 4.54 billion years and a reference point in 2026.
Explore the Earth year firstEach answer is a time interval in a fixed model: months for events up to November, then the days of December, the hours of December 31 and, for the newest events, minutes and seconds. The intervals do not overlap. Only events with a single date reach the quiz, and the uncertainty of a dating never crosses the border of the correct interval.
A round has 10 questions: 3 about Earth, 3 about life and 4 about human history, 2 of them about the last 150 years. After each answer you see the scientific dating, the place in the calendar and the source.
If the answers were months, everything from the first humans to the internet would land in December. So for December events the intervals narrow to days, hours, minutes and seconds. The oldest known traces of Homo sapiens (about 300 thousand years) fall on December 31 at about 11:25PM in the Earth year.
