David Letterman was born on this day in 1947. He's famous for his “top-10” lists. We offer these “stupid human tricks” in his honor. What are the top 10 most-common mistakes we make with regard to household hazardous waste? No. 10: things we pour down the drain, such as old paint solvents. No. 9: household cleaning products. No. 8: wood stains and preservatives. No. 7: toxic garden pesticides. No. 6: swimming pool chemicals and No. 5: the ritual dumping of old paint. Then it’s No. 4: throwing away dead batteries. No. 3: old fluorescent tubes that leak mercury. No. 2 (a former No.1): dumping used motor oil. And the new No. 1 “no-no” for the trash can: throwing away used computer printer ink cartridges with nasty chemicals and toxic ink residue that pollute soil and drinking water. Spring cleaning? Remember the hazardous “top 10” and take your dangerous waste to a certified collection center. And that's the On The House tip for today.