U.S. Constitution question

Would somebody who's a better scholar than I please point me to the section in the federal Constitution where a supermajority vote to pass legislation is required in any instance other than that following a presidential veto?

I keep hearing a simple majority vote in the Senate and House - referred to now as "reconciliation" (I haven't heard that word in 16 years of being a reporter, regarding taking a vote, and I've covered Congressional legislation) - isn't legal. This runs counter to what I remember learning in school. It's been 20 years since I was in school - would somebody please point me to what I've forgotten or missed?

Thanks!

I finally made an icon that RELATES

For you Red Dwarf fans in my life and on my f-list, a sample of the audiobook I shall be listening to as I drive home, on the Zune my sister set up for me (her old one). Click on "sample" under the graphic and turn the sound on, obviously.

You rock those voices, Mr. Barrie. Shag those dulcet tones HARD and make them your beeeeyotch, baby.

Also, stolen from pir8fancier:

There's been a round of discussion about feedback and comments going about LJ; based on one of the questions of comment etiquette I want to say that anytime anyone wants to make a comment on my journal that's not addressed to me but is aimed at another commenter, IT'S FINE. You can:
-pop by to talk to someone you haven't spoken with in a while, or
-discuss the point a commenter makes, or
-go off on a tangent, or
-just say, "Nice icon!" or
-make plans for the weekend with each other,
it's all good. Be my guest, have a good time, don't worry about whether the comment is addressed directly at me if you want to comment. Have fun.

I think I already exemplify this policy - I get lots of people who don't want to talk to ME leaving comments in my journal, from what I can tell. I do discourage flaming, but heated discussion is OK by me - so long as it's about something that matters. No name-calling, though.