If you haven’t heard, Yahoo just acquired Tumblr for $1.1 billion. Everyone is talking about the deal, and the general consensus seems to be that buying a company with little revenue for such a large sum of money is pretty stupid. Critics say that Yahoo is paying too high of a premium for a company with mediocre financials, but they don’t understand what Yahoo is buying.

VideoSci is an interesting new service from dTouch that allows its users to learn by watching. It collects video resources about all fields of science from various places online, making them easily searchable and available at one convenient place.

With $130 million in cash following an October 2012 financing, Barracuda Networks has acquired mobile e-signature startup SignNow. Neither company has announced the transaction publicly, but a trail of Internet breadcrumbs from the last two weeks make a disclosure unnecessary.

Cazimo is another startup that combines daily deals and a game of chance. It offers daily deals to groups of up to five buyers, and one of the buyers gets it free while the others pay a discounted price. It’s a one-in-five chance to get a product you love for free.

Dealotto is an interesting new service that combines the chance and excitement of the lottery with the savings of daily deals. With Dealotto, how much you save depends on how lucky you are.

The “Sharks” on the hit ABC show Shark Tank—Mark Cuban, Robert Herjavec, Kevin O’Leary, Daymond John, Barbara Corcoran, Lori Griener, and retired shark Kevin Harrington—have invested over $20 million in 109 deals presented on the show over the last four seasons.

Sticky, a startup that uses eye-tracking technology to measure ad effectiveness, has raised $3 million in new funding.

For a heavy smartphone user, it’s almost impossible to see battery life last all day without stopping for a charge. But you don’t actually have to be tethered to a wall outlet anymore. That’s the goal of ChargeBite, anyway.

Funding is on the mind of almost every entrepreneur. Before you see any financing, though, you have to understand the investors’ perspective. Investors, by definition, want to make money. Their principal interest is how the startup makes money and how it plans to increase the value of the company. However, most entrepreneurs focus too much on the product and the technology. That’s fine and dandy if you’re delivering a customer presentation, but investors don’t care all that much about the product. They’re more concerned with the business of the product.

Many companies, especially those whose team members work together remotely, need an internal site or wiki of some sort to share information and collaborate—but it can be hard to set one up quickly. Some products are too limited, while others are too complex. Papyrs solves this problem by providing a drag-and-drop social intranet builder.