It's been a busy year, and the "content factory" at Engineering360 and GlobalSpec has been hard at work serving our valued audience members the content they seek.

And what content is that? Well, here's our Top 10 list of 2022 content, as chosen by reader popularity.

1. Here's how hydrogen is powering homes and industry

Hydrogen offers immense promise for both industrial and residential applications. Here's what that looks like — and what obstacles are in the way.

2. Aerodynamics of multirotor drones

Multirotor drones present design challenges related to stability and flight control, but flexibility and ease of use means that these aerodynamic challenges are worth the additional engineering.

3. Single-phase vs three-phase AC: What’s the difference?

Learn about the unique characteristics, advantages, drawbacks and suitability of each phase system for different applications.

4. A flapping-wing drone inspired by birds

When compared to fixed and rotary wing drones, ornithopters offer advantages in energy, range and maneuverability — that is, if designs can be perfected.

5. What's inside an electric screwdriver? See for yourself

Here's what gives this essential tool its inherent ooomph.

6. Lighter-than-air drones: From blimps to balloons

Any drone application that prioritizes low-noise, energy efficiency, high range, high portability or increased payloads can benefit from an LTA UAV.

7. Fundamentals of gas-liquid absorption columns

The purpose of a gas-liquid absorption column is to convert a waste product into something of potential industrial use while simultaneously reducing harmful emissions.