The Cassini spacecraft was exploring Saturn and its moons for nearly 20 years.
In benzene there are sigma bonds and delocalised pi bonds between carbon atoms.
The ancient city of Babylon was built on the banks of the Euphrates River in Mesopotamia.
Rivers play an important role in shaping the Earth's surface: they cause erosion as well as carrying and depositing sediment.
A mushroom is the fleshy fruiting body of a fungus, made up from hyphae.
Before the emergence of motorised vehicles, letters and parcels were delivered by horse-drawn mail coaches.
Machines converting the energy of wind into useful forms of power were already in use in the Middle Ages.
Marie Curie, the only person to win the Nobel Prize in two different sciences, is probably the most famous woman in the history of science.
As a result of the revolutionary advances in the Neolithic, settling human communities established the first lasting settlements.
The popular model of the American automobile factory was the first mass-produced car in the world.
A widespread snail species, also popular as food.
Bats use ultrasound to navigate and hunt for prey.
A game to practise the use of analogue and digital clocks.
The three main types of blood vessels in the human body are the arteries, the veins, and the capillaries.
A fjord is a long, narrow inlet with steep sides, created in a valley carved by glacial activity.
A wide variety of optical instruments are in use today, ranging from microscopes to telescopes.
One of the positive influences of the Ottoman invasion of Europe was the construction of baths.
The Emperor of the vast Far-Eastern empire was the lord of life and death.
The river and marine sailing boats of ancient Egypt were one-masted, oared boats
The last Ice Age ended about 13 thousand years ago.