California Institute of Technology

“If you had to choose an area of interest or two today, what would you choose? Why did you choose your proposed area of interest? If you selected 'other', what topics are you interested in pursuing?”

How to approach it. Name your area precisely and explain the why behind it with a real moment or question that pulled you in, not a career payoff. Caltech wants to see a mind genuinely drawn to a field. Specific sub-topics signal you've explored deeply enough to know what you love.

“Regardless of your STEM interest listed above, take this opportunity to nerd out and talk to us about whatever STEM rabbit hole you have found yourself falling into. Be as specific or broad as you would like.”

How to approach it. Truly nerd out here — pick the obscure thing you can't stop thinking about and let your enthusiasm show in the technical detail. The more specific and slightly off-the-beaten-path, the better. This is where Caltech readers find the unguarded, genuinely curious version of you.

“Tell us how you initially found your interest and passion for science or for a particular STEM topic, and how you have pursued or developed your interest or passion over the last few years.”

How to approach it. Trace an arc from the spark to what you've actually done since — projects, reading, experiments, building. Concrete steps you took matter more than how the interest began. Choose this option if your story is one of sustained, deepening pursuit.

“Tell us about a meaningful STEM-related experience from the last few years and share how and why it inspired your curiosity.”

How to approach it. Center one specific experience and the questions it opened up rather than the accolade it earned. Caltech reads for curiosity that the experience ignited, so dwell on what you wanted to understand next. Choose this option if a single moment best captures how you think.

“How have you been a creator, inventor, or innovator in your own life?”

How to approach it. Show, with a concrete example, something you actually made or solved — the scrappier and more hands-on, the better. Caltech values builders, so describe the problem and what you did about it. It doesn't have to be high-tech; resourcefulness counts.

“What is an interest or hobby you do for fun, and why does it bring you joy?”

How to approach it. Pick something genuinely fun, ideally outside STEM, and let your personality through. A specific, true detail beats a generic hobby. This is your chance to show you're a whole person, not just a problem set.

“If you could teach a class on any topic or concept, what would it be and why?”

How to approach it. Choose a topic that reveals how your mind works and what you can't help getting excited about. A vivid, specific subject says more than a broad field. Let a sentence of genuine enthusiasm carry the why.

“What is a core piece of your identity or being that shapes how you view and/or interact with the world?”

How to approach it. Go for something true and specific rather than the most obvious label, and show how it actually shapes your day-to-day view. One concrete illustration grounds it. This short answer is where the human behind the STEM comes through.

“What is a concept that blew your mind or baffled you when you first encountered it?”

How to approach it. Pick a concept you can convey the wonder of, and explain what specifically rewired your thinking. The aim is to share the feeling of being baffled, then hooked. A precise example beats a famous-sounding one you don't really feel.