What crap is this? Today is simply crap

SS: ok lah, miss sim tried to finish the topic on population but too bad, it isn't that interesting so...erm...our heads juz cannot keep still...

Bio: yipcw taught us some moral education today...hmm...and she started on asexual reproduction and other stuff on the reproduction in plants

English: finally finished oral passaging, we gonna move on to picture description

Maths: vectors again

Geog: nancy tay hurt her toe nail coz of giang :P, hahaz, and today she did something rather special, but it was not that fruitful after all...-_-

Higher chinese: returned gong han, din do very well...and i make two stupid mistakes...haiz...

EP3: mrs chan gave us another moral education coz she was quite disappointed wif one person -_-

Managed to return home not too late (around 5+pm), so i got some free time for myself :D

Some chemistry knowledge:

Krypton is present in the air at about 1 ppm. The atmosphere of Mars contains a little (about 0.3 ppm) of krypton. It is characterised by its brilliant green and orange spectral lines. The spectral lines of krypton are easily produced and some are very sharp. In 1960 it was internationally agreed that the fundamental unit of length, the metre, should be defined as 1 m = 1,650,763.73 wavelengths (in vacuo) of the orange-red line of Kr-33.

Under normal conditions krypton is colourless, odourless, fairly expensive gas. Solid krypton is a white crystalline substance with a face-centered cubic structure which is common to all the "rare gases". Krypton difluoride has been prepared in gram quantities and can be made by several methods.