The mystery of why a 39-storey skyscraper in South Korea began to shake uncontrollably has been traced to an exercise class.
Authorities evacuated the Technomart building in Seoul after its upper floors began to rock up and down for 10 minutes this month.
After ruling out an earthquake, an investigation has blamed a Tae Bo exercise class being held at a fitness centre on the 12th floor.
They conclude that the exertions of the 17-strong class created a vibration that matched the building's own resonance frequency.
According to Chung Lan, a professor in the architectural engineering department of Dankook University: "When an external vibration hits the resonance frequency of a certain object, the vibration is amplified and causes excess shaking even from slight movement."
Reports suggested that the class was exercising to The Power by the German electronic group Snap! and that a new instructor was pushing them twice as hard as normal.
Not the News of the World
Taliban fighters have complained that their mobile phones have been hacked into.
They say false text messages sent from their phones claiming that the Taliban leader, Mullah Mohammed Omar, had died of heart failure were the result of hacking by "Americans and foreigners".
The movement regularly sends text messages to local journalists to publicise important statements. A spokesman for the Nato military alliance refused to comment on the allegations.
At least he called
Minutes after calling his estranged mother to tell her he was about to "drop in", a Swiss man ploughed his aircraft into her house.
Konrad Schmidt, 47, was piloting his twin-engine light aircraft above the house of his mother in Switzerland when he placed the call.
Schmidt, who had been suffering from depression and was involved in a long-running feud with his mother, made a series of low-level passes of the house before aiming the plane at a bedroom window.
The resulting fireball destroyed the house, killing him instantly. Mrs Schmidt, 69, however, was down in the basement at the moment of impact and survived with minor injuries.
Fight tip: drop the armour
After an experiment that involved a suit of armour and a treadmill, researchers have concluded that medieval battles may have been lost because the defeated knights were exhausted even before wielding a sword.
The weight of the armour would have caused breathing problems, intense fatigue on the legs and drained energy, the survey concludes.
Volunteers were dressed in a reproduction of a 15th-century suit of armour and then asked to walk and run on a treadmill.
The study found that the constricting nature of the metal plates, as well as the weight, would have severely affected their ability to fight, speculating that this could have had a deciding effect on some battles, including the defeat of the French by the English king, Henry V, at Agincourt.
Thom Richardson, the keeper of armours at the Royal Armouries in Leeds, England, said: " It confirms what we have always suspected - heavy armour would very much reduce your ability to run around."
jlangton@thenational.ae
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What vitamins do we know are beneficial for living in the UAE
Vitamin D: Highly relevant in the UAE due to limited sun exposure; supports bone health, immunity and mood.
Vitamin B12: Important for nerve health and energy production, especially for vegetarians, vegans and individuals with absorption issues.
Iron: Useful only when deficiency or anaemia is confirmed; helps reduce fatigue and support immunity.
Omega-3 (EPA/DHA): Supports heart health and reduces inflammation, especially for those who consume little fish.
Groom and Two Brides
Director: Elie Semaan
Starring: Abdullah Boushehri, Laila Abdallah, Lulwa Almulla
Rating: 3/5
Killing of Qassem Suleimani
The UAE squad for the Asian Indoor and Martial Arts Games
The jiu-jitsu men’s team: Faisal Al Ketbi, Zayed Al Kaabi, Yahia Al Hammadi, Taleb Al Kirbi, Obaid Al Nuaimi, Omar Al Fadhli, Zayed Al Mansoori, Saeed Al Mazroui, Ibrahim Al Hosani, Mohammed Al Qubaisi, Salem Al Suwaidi, Khalfan Belhol, Saood Al Hammadi.
Women’s team: Mouza Al Shamsi, Wadeema Al Yafei, Reem Al Hashmi, Mahra Al Hanaei, Bashayer Al Matrooshi, Hessa Thani, Salwa Al Ali.
The specs
Engine: 1.5-litre 4-cylinder petrol
Power: 154bhp
Torque: 250Nm
Transmission: 7-speed automatic with 8-speed sports option
Price: From Dh79,600
On sale: Now
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The past winners
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2015 - Nico Rosberg (Mercedes)
2016 - Lewis Hamilton (Mercedes)
2017 - Valtteri Bottas (Mercedes)
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Position: legal consultant with Al Rowaad Advocates and Legal Consultants
6.30pm: Al Maktoum Challenge Round-3 Group 1 (PA) | US$95,000 | (Dirt) 2,000m
7.05pm: Meydan Classic Listed (TB) ) | $175,000) | (Turf) 1,600m
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UAE currency: the story behind the money in your pockets
COMPANY PROFILE
Name: Kumulus Water
Started: 2021
Founders: Iheb Triki and Mohamed Ali Abid
Based: Tunisia
Sector: Water technology
Number of staff: 22
Investment raised: $4 million
RESULTS
Bantamweight title:
Vinicius de Oliveira (BRA) bt Xavier Alaoui (MAR)
(KO round 2)
Catchweight 68kg:
Sean Soriano (USA) bt Noad Lahat (ISR)
(TKO round 1)
Middleweight:
Denis Tiuliulin (RUS) bt Juscelino Ferreira (BRA)
(TKO round 1)
Lightweight:
Anas Siraj Mounir (MAR) bt Joachim Tollefsen (DEN)
(Unanimous decision)
Catchweight 68kg:
Austin Arnett (USA) bt Daniel Vega (MEX)
(TKO round 3)
Lightweight:
Carrington Banks (USA) bt Marcio Andrade (BRA)
(Unanimous decision)
Catchweight 58kg:
Corinne Laframboise (CAN) bt Malin Hermansson (SWE)
(Submission round 2)
Bantamweight:
Jalal Al Daaja (CAN) bt Juares Dea (CMR)
(Split decision)
Middleweight:
Mohamad Osseili (LEB) bt Ivan Slynko (UKR)
(TKO round 1)
Featherweight:
Tarun Grigoryan (ARM) bt Islam Makhamadjanov (UZB)
(Unanimous decision)
Catchweight 54kg:
Mariagiovanna Vai (ITA) bt Daniella Shutov (ISR)
(Submission round 1)
Middleweight:
Joan Arastey (ESP) bt Omran Chaaban (LEB)
(Unanimous decision)
Welterweight:
Bruno Carvalho (POR) bt Souhil Tahiri (ALG)
(TKO)
First Person
Richard Flanagan
Chatto & Windus
The specs
Engine: 2.0-litre 4cyl turbo
Power: 261hp at 5,500rpm
Torque: 405Nm at 1,750-3,500rpm
Transmission: 9-speed auto
Fuel consumption: 6.9L/100km
On sale: Now
Price: From Dh117,059
