Ingenhousz's apparatus added 08.07.2019
Fraunhofer lines added 23.04.2019
Total Lunar Eclipse 2018 added 20.08.2018
First class lever added 12.07.2017
Force on a current carrying conductor
in a magnetic field added 03.06.2017
Halo 22° added 10.05.2017
Linear expansion apparatus added 12.04.2017
Kirchhoff's circuit laws added 02.01.2017
Ohm's law added 14.12.2016
DC Ammeter added 21.11.2016
