Fools were out and about this week in an investing world jampacked with actions and ideas. Here are three articles you might find useful as you decide how to invest your money.

2 Stocks That Are Wasting Your Money
Intuitive Surgical (Nasdaq: ISRG) and Starbucks (Nasdaq: SBUX) are wasting shareholders' money by buying back their own shares. So says Fool contributor Rich Smith.

"After rising so far, so fast, Intuitive is anything but a bargain today," Rich wrote. Starbucks shares also come at a steep price, Rich noted -- "29 times earnings and more than 30 times free cash flow. To me, this looks like an even more egregious waste of shareholder money than we saw at Intuitive Surgical, because Starbucks is growing slower (about 17% annually, projected) and has grown slower for years (about 16% annually)."

Read the article to learn more about these stock buybacks and to see why Rich thinks AIG (NYSE: AIG) is making the right move by repurchasing $1 billion of its own stock.

6 Stocks That Will Stop Your Money Worries
Good advice is sometimes hard to accept. Consider this tidbit from Fool writer and editor Dan Caplinger: "Even with the overall market's lackluster performance over the past decade, stocks remain the best bet for long-term growth of capital." Stock market volatility might be making you nervous, but you need to stay invested if you want to enjoy the retirement of your dreams.

Dan has been reviewing stocks to see how suitable they are for conservative investors, including retirees. He's been looking at sales and cash-flow growth, stock-price volatility, dividend history, and valuation. If you've missed Dan's recurring stock reviews on Fool.com, you're not totally out of luck. This week, he put together a list of six of the best scorers: Medtronic (NYSE: MDT), Chevron (NYSE: CVX), McDonald's (NYSE: MCD), PepsiCo (NYSE: PEP), British American Tobacco, and Wal-Mart.

Read the article to check out how solid Dan's advice is.

3 Things to Remember About Buffett's Buying Spree
Investors refer to Warren Buffett as an oracle. If he says or does anything investing-related, they want to know about it. Fool contributor Morgan Housel gives investors three things to remember as they devour the news that Buffett's Berkshire Hathaway (NYSE: BRK-B) invested about $24 billion last quarter.

Thing No. 1: Buffett doesn't call bottoms. "I don't think it would bother him one bit if stocks fell considerably from his recent buy prices," Morgan wrote. Thing No. 2: It might not have been Buffett doing the buying. Thing No. 3: This is why Buffett is rich.

Read the article to get the full rundown of Morgan's analysis of Berkshire's buying.