Image of the Day: Sperm Donors
Image of the Day: Sperm Donors
Asexual female nematodes use their male offsprings’ sperm to fertilize eggs, but cast away their genes.
Image of the Day: Sperm Donors
Image of the Day: Sperm Donors

Asexual female nematodes use their male offsprings’ sperm to fertilize eggs, but cast away their genes.

Asexual female nematodes use their male offsprings’ sperm to fertilize eggs, but cast away their genes.

sperm
Image of the Day: Motile Swimmers
Image of the Day: Motile Swimmers
Chia-Yi Hou | Jun 12, 2019
Scientists track the movement of sperm flagella.
Image of the Day: Self-Insemination
Image of the Day: Self-Insemination
Carolyn Wilke | Feb 1, 2019
Videos reveal how a female squid fertilizes her eggs—one at a time and without spilling much stored sperm.
Image of the Day: The Long and Short of It
Image of the Day: The Long and Short of It
Sukanya Charuchandra | Aug 20, 2018
For flycatchers, the attractiveness of male birds is tied to the length of their sperm.
Researchers Develop Sperm-Robot Hybrids to Deliver Drugs, Assist Fertilization
Researchers Develop Sperm-Robot Hybrids to Deliver Drugs, Assist Fertilization
Diana Kwon | Apr 1, 2018
The artificially motorized cells may one day help fight cancers in the female reproductive tract.
Researchers Cryopreserve Coral Sperm
Researchers Cryopreserve Coral Sperm
Catherine Offord | Feb 1, 2018
A project aims to preserve samples of the climate change–vulnerable animals for future restoration.
Coral Sperm Banker
Coral Sperm Banker
The Scientist Staff | Jan 31, 2018
Mary Hagedorn is racing to save Earth’s coral reefs by developing techniques for freezing the colonial animals’ gametes.
New Techniques Detail Embryos’ First Hours and Days
New Techniques Detail Embryos’ First Hours and Days
Jef Akst | Dec 1, 2017
New technologies reveal the dynamic changes in mouse and human embryos during the first week after fertilization.
Infographic: How Embryos Take Control of Their Own Development
Infographic: How Embryos Take Control of Their Own Development
Jef Akst | Nov 30, 2017
The switch from maternal factors involves dynamic reprogramming of the zygotic genome.
Image of the Day: Sperm Protectors
Image of the Day: Sperm Protectors
The Scientist Staff | Aug 18, 2017
Among their many functions, macrophages in mouse testes guard sperm against attacks by other immune cells.