Key Points Upgrades that are both practical and good-looking usually offer the best value.Going too fancy or too personalized ...

CNET staff -- not advertisers, partners or business interests -- determine how we review products and services. If you buy through our links, we may earn a commission.

Virus entry into animal cells is initiated by attachment to receptors and is followed by important conformational changes of viral proteins, penetration through (non-enveloped viruses) or fusion with ...

U.S. citizens have a right to enter the country, but non-citizens can be denied entry for various reasons. Required documentation for entry varies based on citizenship, visa status, and mode of travel ...