MSN- confusion ?

Deborah says: (11:58:03 PM)
haha where are you now?
Let's Dance says: (11:58:17 PM)
at home...
Deborah says: (11:58:32 PM)
i mean..
Deborah says: (11:58:35 PM)
science??
Deborah says: (11:58:38 PM)
hhahaha :)
Let's Dance says: (12:00:32 AM)
hahahaah
Let's Dance says: (12:00:36 AM)
haha
Let's Dance says: (12:00:40 AM)
haha
Let's Dance says: (12:00:48 AM)
haha
Let's Dance says: (12:00:58 AM)
i can't stop laughing!