There are three new science weapons found so far:

1. "Employee Benefits" - healing handgun

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You can get it from NPC "Dr. Jasper Low" (either peacefully or not)

2. "Special Delivery" - rocket-launching heavy weapon

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You can get it from unique enemy "Charles from Accounting"

3. "The P.E.T." - two-handed melee axe/spear

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You can get it as a reward for the quest "A Dialog Between Dead Men"