# Key Points from IRC Log

• A user shared several resources related to computer modeling of embryogenesis, including the House Mouse Atlas of Embryonic Development, links to surface evolver simulation software, and research on cell patterning in Drosophila retina that suggests surface minimization principles govern cell packing similar to soap bubbles.

• Fenn created and shared a battery comparison chart analyzing different battery types, noting that 18650 batteries offer better energy density (Wh/kg, Wh/$, Wh/l) than AA batteries, but lack compatible holders, prompting discussion about battery compatibility issues and data organization.

• Several semantic data organization tools were discussed, including Semantic MediaWiki (SMW) as a potential solution for organizing technical data with ontological relationships, though some users expressed frustration with its implementation complexity.

• Users discussed computational geometry concepts including Reeb graphs for topology representation, with mentions that Blender implements Reeb graphs for skeleton generation and that they can be used for part matching and similarity search in 3D models.

• Resources on exoskeletons were shared, including Lockheed Martin's new exoskeleton and a 340cm bipedal exoskeleton called "Land Walker," along with discussions about piezoelectric elements for precise positioning systems.

• A link was shared to a DIYbio San Francisco project about creating glow-in-the-dark organisms, representing ongoing biohacking activities in the community.