When we talk about building new technology, we’re often talking about building it out of artificial ingredients. But as we understand our natural world better, the area of biotechnology is growing. And a person at the forefront of using biotech in everything from medical instruments to consumer electronics is Angela Belcher, professor of biological engineering at MIT. She’s been looking at sea snails and how they might help us build new technology.

It’s Friday and that means Silicon Tally time. This week’s guest is Gizmodo Staff writer Leslie Horn. And, Twitter’s stock may have jumped over 70 percent when going public yesterday, but Facebook also had some key growth this week in Cambridge Massachusetts. The company has confirmed that it’s opening a Boston area office not far from the spot it was born those many moons ago in a Harvard University dorm room.

It’s important to remember that in the tech world, venture capitalists come in all shapes and sizes. And a high profile V.C. just reportedly dropped $1.1 million on a new social network for teenagers called Shots of Me. Who is this mystery man? None other than Justin Bieber. Also, this week after months of waiting, Tom Wheeler became head of the Federal Communications Commission. As the new head of the body that regulates all kinds of communication, Wheeler will face some big issues.

In honor of Twitter’s initial public offering, scheduled for tomorrow, today’s show is all about Twitter. Bells will ring, investors will line up and company leaders are hoping that the New York Stock Exchange will not repeat the NASDAQ’s bungling of Facebook’s IPO last year. But it won’t just be Twitter’s employees and potential investors who are watching. A lot of people in the tech world think Twitter’s IPO is signaling an important moment for the industry.

“Call of Duty: Ghosts” comes out today. And expectations for global sales of the so-called first person shooter video game are high — like 25 million copies high. But it won’t get there without a big marketing budget spent by publisher Activision. Plus, comparing today’s IPOs to those from six years ago. And, new farming technology.

The Obama administration has made it a priority to invest in advanced battery technology for the future. But there’s another technology revolutionizing energy storage — the supercapacitor. Also, why Snapchat has the potential to be the next big social media investment. And, are teens opting out of Facebook?

Colonel Chris Hadfield is probably the most famous Canadian astronaut ever. And after playing and shooting a music video of David Bowie’s song “Space Oddity” from the International Space Station, he might be the most famous astronaut of our era. But Hadfield’s story is also about farm life in Canada and about the behind the scenes journey to travel outside our atmosphere. It’s all in his new book, “An Astronaut’s Guide to Life on Earth.”

This week marks a year since Hurricane Sandy hit the East Coast. One of the problems persisting in New York City is keeping our transit systems from flooding. Many New Yorkers can remember walking from Midtown through a darkened city last fall while the Transit Authority was still assessing the damage — much of it from water. Well, a company has a tech-y solution to this — an inflatable plug that could be blown up to keep water out of a tunnel when flooding occurs.

Our gadget love is fickle. Bits and pieces of the technology are always getting a little bit better. Chips, software, you name it. So companies keep making new phones and electronics and we keep buying them. And throwing them out at a rate of millions of tons per year in the U.S. alone. But there might be some good news. Something called Phonebloks just got buy in from a big phone maker. The idea is a modular phone — almost like it’s made out of Legos — that you can improve with new parts.