Hard Trivia Quiz
These questions are built to beat confident guessing, yet every answer can be reasoned out.
Hard trivia with answers that you can still work out: science, inventions, landmarks and numbers where careful thinking beats a quick guess. Every answer comes with an explanation.
Did you know?
- Gallium was predicted before it was found. In 1871 Dmitri Mendeleev left a gap in his periodic table for an element he called eka-aluminium and forecast its properties. When the French chemist Paul-Émile Lecoq de Boisbaudran discovered gallium in 1875, its density and other features closely matched the prediction.
- The Eiffel Tower is repainted roughly every seven years, using around 60 tonnes of paint. Its iron expands in summer heat, so the top can shift by several centimetres, and the tower leans slightly away from the Sun as the side facing it warms and grows.
- Many pyramids at Meroë now stand with flattened tops. In the 1830s an Italian treasure hunter, Giuseppe Ferlini, damaged dozens of them while searching for gold, and he did find a cache of jewellery in one, which encouraged others to dig in the region.
What makes trivia hard
Hard trivia is not about obscure dates that nobody could know. The best difficult questions have answers that feel surprising at first but make sense once explained, and they reward people who reason from what they already know. A good hard question offers plausible choices, so knowledge and logic matter more than luck. The sections below give background to the questions in this quiz, from the physics of light in the sky to the history of early inventions.
Light in the sky
Auroras form when streams of charged particles from the Sun reach Earth and are guided by its magnetic field towards the polar regions. There they collide with gases in the upper atmosphere and make them glow, much like the gas inside a fluorescent tube. Activity rises and falls with the Sun's roughly eleven-year cycle, and during strong solar storms auroras can be seen far from the poles. Similar lights have been observed on Jupiter, Saturn and other planets with magnetic fields.
Inventions ahead of their time
Many inventions appeared long before they became part of daily life. Fax machines existed decades before the telephone but remained rare until the 1980s, when cheap machines and standard phone lines made them common in offices. The first electric vehicles date from the 1830s, and electric taxis ran in London and New York in the late 1890s. Ideas often wait for supporting technology, such as better batteries, networks or cheaper materials, before they can spread.
Numbers with a story
Large numbers have long fascinated mathematicians. A googol is far bigger than the estimated number of atoms in the observable universe, which is usually put at around 10 to the power of 80. Kasner also named the googolplex, 1 followed by a googol of zeros, a number so large it could not be written out even if every atom in the universe were used as paper. Such numbers help explain the difference between very large and truly infinite.