The One Tide a Day

Most places in Australia have two tides a day, but there's only one at Margaret River. This is because of the geometry of the earth and the moon - not what's happening at Corumba or Broom. Most of the energy around the world, about 90% of the energy, is in the two tides per day. And you also use this to work out the oxygenation level in your skin. So that technology is around now just on ordinary commercial devices. Oh, my gosh. Isn't that what a world we're living? We've got Vanessa in Torquay with her questions for us today.