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Ancient Earthquake Detector
Although we still cannot accurately predict earthquakes, we have come a long way in detecting, recording, and measuring seismic shocks. Many don’t realise that this process began nearly 2000 years ago, with the invention of the first seismoscope in 132 AD by a Chinese astronomer, mathematician, engineer, and inventor called Zhang (‘Chang’) Heng. -
Oct 11, 1500
Roman Concrete
The Romans made concrete by mixing lime and volcanic rock. For underwater structures, the combination of lime and volcanic ash with seawater instantly triggered a chemical reaction in which the lime incorporated molecules into its structure and reacted with the ash to cement the whole mixture together. -
Ancient Microscope
The Nimrud lens is a 3,000-year-old piece of rock crystal, which was unearthed by Sir John Layard in 1850 at the Assyrian palace of Nimrud, in modern-day Iraq. The Nimrud lens (also called the Layard lens) is made from natural rock crystal and is a slightly oval in shape. -
Modern Microscope
With the advancement of technology and improved optics, the microscope as we know it today came into being. The theoretical minimum size able to be viewed by an optical microscope is 200nm (as defined by Abbe), since optical microscopes are only able focus on objects that are at least the size of a wavelength of light (usually, a wavelength of around 550 nm is assumed). -
Modern Calender
The Gregorian calendar, also called the Western calendar and the Christian calendar, is internationally the most widely used civil calendar. It is named for Pope Gregory XIII, who introduced it in 1582. -
Modern Concrete
Concrete is a composite material composed of aggregate bonded together with a fluid cement which hardens over time. -
Modern Earthquake Detector
Seismometers are instruments that measure motion of the ground, including those of seismic waves generated by earthquakes, volcanic eruptions, and other seismic sources. Records of seismic waves allow seismologists to map the interior of the Earth, and locate and measure the size of these different sources. -
Ancient Calender
With the advancement of technology and improved optics, the microscope as we know it today came into being.The theoretical minimum size able to be viewed by an optical microscope is 200nm (as defined by Abbe), since optical microscopes are only able focus on objects that are at least the size of a wavelength of light (usually, a wavelength of around 550 nm is assumed).
