28.Sep.2013 11DR: SOUNDS
Warning: Use of undefined constant user_level - assumed 'user_level' (this will throw an Error in a future version of PHP) in /home/customer/www/dairyriver.com/public_html/wordpress/wp-content/plugins/ultimate-google-analytics/ultimate_ga.php on line 524
John Tyndall (1820-1893), British physicist who made numerous contributions to the advancement of science, including acoustics. He was particularly motivated by problems with foghorns.