Like a lot of people, I've been curious about exactly how chemistry works. Since the chemistry system isn't in the normal objects package, it's not something modders can look at. That means that the only way to test it is through empirical tests.

Recently, with the help of SimSpy I conducted a series of tests to see how different characteristics affected chemistry.

DESCRIPTION: Sims who are sick or in first stage of pregnancy will now get carpool warnings. I have no idea why the game was designed to suppress them - even if you call in sick you still need to know when to do so.

LAST UPDATE: April 30, 2008

REQUIRED EPs: None

COMPATIBLE EPs: All configurations from the base game through Free Time.

DESCRIPTION: Prevents wolves other than Leader of the Pack from visting your property. These other wolves appear to do nothing other than scratch at the door. LotP is not affected.

LAST UPDATE: April 15, 2008

REQUIRED EPs: Pets

COMPATIBLE EPs: All configurations from Pets through Free Time.

DESCRIPTION: Sims won't autonomously drink coffee, espresso, or hot cocoa if they should be sleeping.

If it is within 8 hours of a sim's wake time, the sim will not drink caffeinated beverages. Wake time is determined by sleepclock (if one is found) or defaults to 6 am (if sleepclock is not installed or one is not assigned to that sim).

This means your average sim with a wakeup time of 6 am will not drink coffee, etc. after 10 pm.

This mod also prevents servos from ever drinking these beverages.

DESCRIPTION: Prevents sims from autonomously using "talk through" with stuffed animals. Unlike other versions of this I've seen, it should work with all stuffed animals (including cloned ones) not just the teddy bear.

LAST UPDATE: September 12, 2007

REQUIRED EPs: None

COMPATIBLE EPs: All configurations from the base game through Free Time.

DESCRIPTION: Hydrobots will break down FAR less often.

The original code gives a cumulative 0.25% chance of breakdown per spray, meaning hydrobots will break down after approximately 23 sprays. There is a minimum of 1 day between breakdowns.

This mod reduces the chance to 0.025% per spray, meaning approximately 74 sprays to break, and has a minimum of 5 days between breakdowns.

LAST UPDATE: September 5, 2007

REQUIRED EPs: Open For Business

COMPATIBLE EPs: All configurations from Open For Business through Free Time.

DESCRIPTION: If you end a date on a residential lot and that date is with a townie or a sim from another lot (in other words, a non-selectable sim) then the sim will automatically go home.

LAST UPDATE: September 12, 2007

REQUIRED EPs: Nightlife

COMPATIBLE EPs: All configurations from Nightlife through Free Time.

DESCRIPTION: Makes changes in how outfits are selected for townies and newly-aged sims.

Dragon prevents the dragon outfits from being randomly selected, though they can still be chosen by the player.

Floaties makes the kids swim floating swimwear only, not everyday wear.

Holiday prevents baby new year, Santa Claus, and Mrs. Claus from being randomly selected, though they can still be chosen by the player.

LAST UPDATE: April 15, 2008

DESCRIPTION: Prevents autonomous "take out trash" unless bin is at least half full. Doesn't affect trash emptying commands from the user or from Pescado's Macrotastics.

LAST UPDATE: April 15, 2008

REQUIRED EPs: None

COMPATIBLE EPs: All configurations from the base game through Free Time.

DESCRIPTION: Drastically lowers the sleep threshold so that servos are far less likely to sleep after woohoo.

LAST UPDATE: April 13, 2008

REQUIRED EPs: Open for Business

COMPATIBLE EPs: All configurations from Open for Business through Free Time.