Author Archives: John Pullen

Most people who travel by air know that there are pressure changes when the aircraft climbs and descends. This is often reflected in their ears “popping” as the ear attempts to equalise the pressure changes. But few of them understand what goes on during these phases of a flight.     As you gain altitude, airContinue reading “Science: Airline Passengers under Pressure”

Those who know London will tell you that there are many tunnels crossing underneath the River Thames. Some carry motor vehicles, others trains and tube trains and a couple are for pedestrians. The latter two are located at Greenwich and Woolwich. But there is another pedestrian tunnel which remains unknown to most people.     ItContinue reading “Secret London Thames Tunnel”

Our planet is not as hospitable as you might like to think. And finding the right environment in which to live may not be that straightforward. Many parts of the world are not that suitable for humans to survive in. The oceans are pretty much out for the vast majority of us. But so isContinue reading “Room to Live”