Tag Archives: Media

Hefele

Duet Yourself – the science of polyphonic overtone singing

When most people praise the quality of a duet, they expect to be congratulating two people. But, as a video that’s gone viral this week has proved, that assumption need not always hold true. In just over eight days German singer Anna-Maria Hefele has racked up 4 million views on YouTube by demonstrating her phenomenal ability to sing two separate melodies at the same time.

Hefele’s performance is an example of polyphonic overtone singing, a technique which allows her to produce two distinct notes in perfect harmony.The lower of the two is generated by the vibrations of vocal folds in the larynx: the same process as occurs in everyday speech. This sound wave is said to have a fundamental frequency, as it has the longest wavelength that will fit inside the resonant cavity formed by the speaker’s mouth and throat.

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DocWho

The science at the end of the Whoniverse

Yes that’s right, Doctor Who is back on our screens, spitting himself out of dinosaurs’ mouths and into our hearts where he belongs. On this week’s episode, the first of Series 8, a homicidal android is stalking the streets of Victorian London, mutilating golden-hearted cockneys for their fleshier organs and turning the remains into donor kebabs in order to conceal the evidence of his crimes.

Slap bang into the middle of this mess lands the Tardis, lodged inside the throat of an exceptionally irritable tyrannosaur. Trapped on board are the wide-eyed Clara Oswald and the new and improved Time Lord Peter Capaldi – whose saurian features make the aforementioned reptile look positively cuddly.

The Doctor’s arrival is greeted with a clash of symbols.

cymbals1

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