Only seldom are square/rectangular shapes found in nature. One notable exception is the bird feather shaft -why?

Only seldom are square/rectangular shapes found in nature. One notable exception is the bird feather shaft -why?
John Rogers and his team report a colorimetric epidermal UV dosimeter and temperature sensor with integrated Near Field Communication (NFC) capabilities.
Researchers have reported the synthesis of potassium iron (II) hexacyanoferrate dehydrate nanocubes with a high potassium ion content and their application as an electrode material in aqueous electrolyte potassium-ion batteries.
The initial foundation to achieve biomimetic human robots may be here, via a platform for the rapid fabrication of biologically relevant artificial tissues and organs which was recently proposed.
Researchers from the University of South Australia reveal how they use non-toxic porous silicon nanoparticles (pSi NPs) for the controlled release of FnAb to diabetic wounds.
A process for the fabrication of open-cellular aluminum nitride foams by the replica technique avoiding the usage of organic solvents has been developed.
Shin-Hyun Kim and his coworkers at the Korea Advanced Institute of Science and Technology (KAIST) have developed a simple method to create bicolored Janus particles via phase separation of polymers in emulsion drops.
Dr. Tan and colleagues, have developed a scalable and one-pot electroless galvanic cell synthesis of semiconductor-metal-semiconductor (S-M-S) interconnected nanoarray.
Researchers present the use of Au@MIL-88(Fe) nanoparticles that serve as triple-modality imaging agents, in CT, MRI, and PA imaging of gliomas.
Newly developed composite tribond offers a possible steel solution for lightweight applications.