Bee:
+ don't explode on time expiration but fall instead (still explodes on impact)
* avoid side-effects by removing flag sharing between different bees.
#include <QtGui/QApplication>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}