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How can you determine the longest substring in a string that contains no repeats?

What strategies would you use to support Duolingo's growth?

How would you effectively convey an unfortunate but necessary 10% increase in prices?

What practices are recommended for overcoming covariate imbalance in machine learning, and how do they aid in enhancing model robustness?

Can you recommend tools or techniques for visualizing complex, multi-dimensional data?

How did you deal with a risk you took?

Give me a high-level overview of your background. What's your most relevant experience for Duolingo

Can you describe the steps you take to promote a positive and productive work environment?

For those of us not well-versed in decision trees, could you provide an explanation of bias and variance and how they're pertinent? Additionally, could you share with us which of those two is tougher to deal with: high bias or high variance - and why?

Can you tell me about a time when your research was used to inform a decision?