Category Archives: Science

Arts, History, Science, Society

Quantum Leaps: ‘Leonardo Da Vinci’

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1452 – 1519

It is something of an indulgence to include Leonardo Da Vinci in any study of scientists who changed the world, not least because most of his work remained unpublished and largely forgotten centuries after his death. His, however, was undoubtedly one of the most brilliant scientific minds of all time; arguably the biggest handicap preventing him from profoundly changing the world was the era in which he lived.

The genius of Leonardo’s designs for his inventions so far outstripped both his contemporaries’ intellectual grasp and contemporary technology that they were rendered literally inconceivable to anyone but him. If Leonardo could have teleported to Edison’s time, with his access to nineteenth century technology, one can only speculate how much more he may or may not have achieved than even Edison himself. But even in his own time, Leonardo’s achievements were notable:

. RENAISSANCE MAN

Leonardo is celebrated as the Renaissance artist who created such masterpieces as the Last Supper (1495 – 97) and the Mona Lisa (1503 – 06), yet much of his time was spent in scientific enquiry, often to the detriment of his art. The range of areas Leonardo examined was breathtaking. It included astronomy, geography, palaeontology, geology, botany, zoology, hydrodynamics, optics, aerodynamics and anatomy. In the later field, in particular, he undertook a number of human dissections, largely on stolen corpses, to make detailed sketches of the body. Irrespective of the breadth of his studies, however, perhaps the most important contribution Leonardo made to science was the method of his enquiry, introducing a rational, systematic approach to the study of nature after a thousand years of superstition. He would begin by setting himself straightforward scientific queries such as ‘How does a bird fly?’ Next, he would observe his subject in its natural environment, make notes on its behaviour, then repeat the observation over and over to ensure accuracy, before making sketches and ultimately drawing conclusions.

. AERODYNAMICS

Moreover, in many instances he could then directly apply the results of his enquiries into nature to designs for inventions for human use. For example, his work in aerodynamics led him to make sketches for several flying machines – which, potentially, could have flown – including a primitive helicopter, some five hundred years before the invention became a reality. He even envisaged the need for his flying machines to have a retractable landing gear to improve their aerodynamics once airborne. In 1485 he designed a parachute, three hundred years before becoming an actuality, and included calculations for the necessary size of material to safely bring to ground an object with the same weight as a human. He also had an excellent understanding of the workings of levers and gears, enabling him to design bicycles and cranes.

. HYDRODYNAMICS

Leonardo’s studies in hydrodynamics led to numerous sketches on designs for waterwheels and water-powered machines centuries before the industrial revolution. In addition, he sketched humidity-measuring equipment as well as a number of primitive diving suits, mostly with long snorkel devices to provide a supply of air.

. MILITARY INVENTIONS

During his work for the Duke of Milan between 1482 and 1499, Leonardo prepared an array of designs for weaponry such as catapults and missiles. Even in this arena, however, he could not help but create sketches of weapons that lay way ahead of their time such as hand-grenades, mortars, machine-type guns, a primitive tank and, most audaciously, a submarine.

Leonardo’s Influence

Any list of scientists ‘who could’ have changed the world, then Leonardo Da Vinci would surely be at the top of the list. But although many of the designs for his potentially world-changing creations were never published, his methodical approach to science marks a significant and symbolic stepping-stone from the Dark Ages into the modern era.

Hoping to secure employment with the Duke of Milan, he wrote to him that his areas of expertise included: the construction of bridges and irrigation canals, the designing of military weapons and architecture, as well as painting and sculpture. To add to the list, Leonardo is also credited with being the first ever person to conceive of a bicycle.

Supplementary appendage:

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Leonardo Da Vinci painting: The Mona Lisa. An oil painting by the Italian Renaissance artist which was created in 1503.

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Education, Puzzle, Science

Questions of Science: How do you build a time machine?

INTERNATIONAL DATE LINE?

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The International Date Line (IDL).

MOST READERS will have heard of the International Date Line (IDL), established as an irregular line, drawn by convention through the Pacific Ocean, substantially along the 180th meridian. IDL marks the place where the date changes.

Crossing the line from west to east, travellers gain a day and, conversely, lose a day traveling east to west.

The position of the IDL has been arbitrarily designated and is partly curved to accommodate eastern Siberia, then bulges westward again in order to avoid crossing land.

Let us now assume that a super-fast aircraft can take its passengers around the equator, circling the globe in six hours. Flying west to east it will cross the IDL four times in 24 hours and consequently lose four days. Starting, say, on March 18 it will land on March 14. Continuing the journey the passengers will go back into history, eventually reliving the birth of Jesus Christ. Traveling east to west they will travel into the future, giving them a decisive advantage in the lottery on one’s return.

Have I managed to build a time machine, or is there something wrong with this reasoning?

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Britain, Climate Change, Energy, Government, Science

The UK’s energy dilemma

UK ENERGY NEEDS

Intro: Britain is facing a pressing problem in coping with its complex energy demands

DELAYS to the construction of the controversial Hinkley point raises a number of important questions on how the UK might meet its future energy needs. Pressingly, as the UK searches for options in how its future baseload power can be met without heavily polluting the environment, a solution in bridging the energy-gap will soon be required.

Britain is facing a pressing problem in coping with its complex energy demands. It needs to provide extra energy to meet rising demands for power in the future but at a reasonable cost – while also reducing carbon emissions by considerable levels in order to meet its climate change commitments. This will not be an easy combination to achieve. Hinkley Point, however, was considered by many experts to be a crucial determinant in reaching these goals.

Equipped with a massive 3.2bn watt capacity, Hinkley Point C has capacity in providing 7% of the nation’s electricity if completed. That would help to generate the power that would keep the nation working while renewable energy sources, mainly wind turbines, would provide the rest of the electricity needed by domestic households and firms. As one spokesperson from the Grantham Research Institute said: ‘You have to have some baseload source to provide power when it is utterly calm and renewables are not providing energy . . . Gas and coal plants – which can also supply that baseload – will no longer be viable in the future because of their carbon emissions (which cause global warming). You are then left with nuclear.’

This dilemma exposes a major drawback that affects renewable energy. Wind and solar plants are intermittent power supplies. They often provide power when it is not needed but fail to provide it when it is most needed. Until a method of storing energy on an industrial scale is developed, this drawback will continue to impede its deployment across the country. Research into ways to store energy on a large scale is now being pursued across the globe but may take decades. Other game-changing energy projects are also being worked on.

One of the most important of these future developments is fusion power (see annotation below).  This aims to recreate the process that provides the Sun with its energy. Nuclei of hydrogen atoms are fused together at colossal temperature inside huge reactors to create helium nuclei. The process also creates vast amounts of excess energy but with little pollution or radioactive contamination. Nonetheless, current devices – in particular, the international ITER fusion reactor, being built as a collaborative programme in France with British involvement – are years behind schedule and vastly over budget. Few experts believe fusion will get us out of our current energy problem.

Alternatively, we could continue to utilise carbon capture and storage (CCS), a process which uses fossil fuel plants which takes their carbon dioxide emissions, liquefies them and pumps them underground into porous rocks. Furthermore, Britain has huge, empty North Sea oil fields which many geologists and energy experts believe would be ideal for storing liquefied carbon dioxide. Several test projects were set up in recent years, with the government pledging to provide funding of up to £1bn. In November last year, though, it abruptly cancelled the programme, halting work on all major CCS projects. As devastating that announcement was to those engaged in development work, such technology is critical for the UK’s economic, industrial and climate policies.

Annotation:

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A fusion reaction involves the combining (or fusing) of two or more atoms to make one single atom. Fusion reactions are the ones which power our stars. In a simple fusion reaction shown, two isotopes of hydrogen combine to form one atom of helium.

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