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What are the risks, really?

Experience of life suggests that anything which is fun tends to be either illegal, immoral, fattening or dangerous. Recreational diving partly conforms to this universal law, ranking below hang gliding and parachuting but above most sports in regards to the risk of a fatal accident.

One might suppose that shark teeth are harder than human teeth but they are not.
One might suppose that shark teeth are harder than human teeth but they are not.

Why sharks don't get cavities

To gain a better understanding of how sharks manage to keep their teeth in such pristine condition, a team of German researchers looked at two species that eat in very different ways

The researchers looked at Isurus oxyrinchus and Galeocerdo cuvier (mako and tiger sharks) and found, as they explain in their paper published in the Journal of Structural Biology, after very close examination, that the outer coating of the shark teeth contained one hundred percent fluoride.

HMS Poseidon
HMS Poseidon

China secretly salvaged British submarine

China's claim that the hull of the vessel contained no human remains, identity tags, watches, rings or other personal items has provoked anger among relatives of the men who died

On 9th June 1931 HMS Poseidon was exercising 20 miles north of her home base of Wei Hai Wei when the steamer Yuta was spotted some distance away. Despite excellent visibility, the two vessels collided and the submarine sank within two minutes.

The newly discovered seamount rises to just 40 metres (131ft) below the surface
The newly discovered seamount rises to just 40 metres (131ft) below the surface

Seamount found in the Red Sea

Yemeni fishermen evidently knew the mount existed – Echo found a dhow anchored on its summit as she carried out her survey of the area.

But existing charts of the area suggested the sea was 385 metres (1,263ft) deep – but over an eight-hour period, Echo collected reams of information with her sounders to prove otherwise.

After processing all that information, 24 hours later the powerful computers aboard the ship produced the stunning 3D imagery which revealed the true extent of the mount.

Israel: Journey Beyond the Three Seas

On my first flight to Israel, I stretched out in a comfortable chair on EL AL Airlines, enjoyed a kosher meal and reread notes by the famous Russian traveller and pioneer explorer, Afanasiy Nikitin (circa 1466-1472). Only on the approach to Tel Aviv did I suddenly realize how small a country Israel was, and that it bordered three seas.

Point & Shoot

When it comes to cameras, traditionally, gear is divided into compact point-and-shoot or single lens reflexes (SLR). Compact point-and-shoot cameras are simple devices that many people use just for snapshots. In order to keep the price low, the lenses are not as sharp as the ones designed for SLRs. Some compact cameras are compatible with add-on conversion lenses to expand their range.

A painted comber hides in the seagrass

Fish get emotional too

Now, additional findings lends further credence to the notion that fish do indeed possess emotions and harbour thought processes. It turns out that fish growing up in the wild among predators use their left eye to look at novel objects, while their offspring raised in captivity use the right eye.



Dr Neal W. Pollock (left) and Dr Richard D. Vann
Dr Neal W. Pollock (left) and Dr Richard D. Vann

Preventing decompression sickness in astronauts

A research team at the Duke University Hyperbaric Centre, (North Carolina, USA) has won a Johnson Space Center (JSC) Group Achievement Award from NASA. The Durham-based team comprising Dr Neal W Pollock, Dr Richard Vann, Mike Natoli and Dr Richard Moon developed an in-suit light exercise pre-breathe regimen to prevent decompression sickness from developing in astronauts.