Pyro Spectaculars, the company that produced the fireworks display for Boston's celebration, used new "HD Fireworks" in this year's show. The new fireworks are designed to detonate at lower altitudes with richer colors that work well with the High Definition broadcast.

Eric D. Schmiedl—The Tech

Pyro Spectaculars, the company that produced the fireworks display for Boston's celebration, used new "HD Fireworks" in this year's show. The new fireworks are designed to detonate at lower altitudes with richer colors that work well with the High Definition broadcast. Eric D. Schmiedl—The Tech