Small Inventions That Made a Big DifferencePockets, matches, spectacles, postage stamps. Whether it's the stitches that hold our clothes together or the syringes that deliver life saving vaccines, small things really do make a big difference. Yet these modest but essential components of everyday life are often overlooked. Science and comedy writer Helen Pilcher shares the unexpected stories of 50 humble innovationsfrom the accidental soldering of two bits of metal that created the pacemaker,