Reletter
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Explorations in computing and robotics focused on power-efficiency and safety -- personal posts by Avik De, robotics Ph.D. and founder

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Substack
PricingOnly free issuesPublishesWeekly
Issues39Founded8 months agoLast Issue11 days ago
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Latest Issues

Should Robots Run Like Humans or Ostriches?

Ostriches and humans are both capable terrestrial runners, and they both weigh about ~100kg in rough order of magnitude. However, they look quite different when they run. Take a look at these snapshots of a human running compared to an ostr...

11 days ago
7
3

Are Robotics Policies Lookup Tables?

Generalist robotics policies (such as Vision-Language-Action or VLA models) have made frequent appearances on this blog. These huge models have performance and generalization characteristics that surpass our theoretical understanding, which...

18 days ago
16
3

How Thermals Constrain Robots, Chips, and Space Datacenters

In a prior article, I wrote about the principles behind designing record-breaking running robots. As I wrote then, one of the most helpful innovations over commercial humanoids appeared to be thermal:

What should we conclude from Honor’s...

25 days ago
33
3

What an Alternate History of the RISC vs. CISC Debate Teaches Us About Robotics

Recently, Elon Musk staked a claim that LLMs would eliminate the need for high-level computer programming languages, since they could compile directly to machine code.

Effectively, underlying that claim is a comparison between two pathways...

2 months ago
9

Action Tokens: Fine-Grained vs. Behavioral Primitives

When Claude Opus 4.7 got released, it got some backlash from people who noticed that it was using up tokens faster for their tasks. The cause of this was a new tokenizer that would use more tokens for the same query or response.

Users were...

2 months ago
15

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Authors

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  • Avik De

    Adjunct Prof @ UPenn | Chief Science Officer @ Ghost Robotics.

  • Bharath Suresh

    Engineer and Writer

  • Chris Paxton

    Roboticist and AI researcher

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