Daydreaming in summer, looking upwards, he noticed that the larger birds, hawks and eagles, could stay aloft for longer, riding thermals with supreme elegance without flapping their wings.
As paragliders and glider pilots, they soar like hawks higher and higher, using air heated by the sun, called thermals, to rise high in the sky.
This usually grants a hang glider a good ten-minute flight back down to Earth, even if there are no rising thermals to help keep the craft aloft.
The shops are already packed with thermals. Yes, winter's definitely knocking at the door. But it needn't bring with it the usual litany of coughs and sneezes, dry skin and cold hands.
