Explain that unlike sound, light waves travel fastest through a vacuum and air, and slower through other materials such as glass or water.

The work demonstrates that, after passing the light beam through a mask, photons move more slowly through space. This finding shows unambiguously that the propagation of light can be slowed below the commonly accepted figure of 299,792,458 metres per second, even when travelling in air or vacuum.

Jamaican two-time Olympic champion clocks 10.63 in Kingston to run the quickest 100m since world record-holder Florence Griffith-Joyner. Shelly-Ann Fraser-Pryce has underlined her Olympic credentials by becoming the second-fastest female 100m athlete in history on Saturday (June 5).

Sha’Carri Richardson

Shelly-Ann Fraser Pryce

Septe

Shelly Ann Fraser Net Worth: Shelly Ann Fraser is a Jamaican track and field sprinter who has a net worth of $4 million.

10.49 seconds

Only moments before Fraser-Pryce — this time with her long hair arranged in a rainbow-pastel pastiche — blasted past the field in a season-best 10.71 seconds , new mom Allyson Felix surpassed none other than Usain Bolt with her record 12th gold medal at worlds.

The current men’s world record is 9.58 seconds, set by Jamaica’s Usain Bolt in 2009, while the women’s world record of 10.49 seconds set by American Florence Griffith-Joyner in 1988 remains unbroken.

But while the consensus of opinion says it is unlikely that women will ever outrun men, Tatem suggests keeping an open mind.