I was having a problem with Ars articles being blank, and I found that the feed URLs had changed.
These work:
Spoiler:
feeds = [
('Ars Technica', 'https://arstechnica.com/feed/'),
('Features', 'https://arstechnica.com/feautes/feed/'),
('Technology Lab', 'https://arstechnica.com/information-technology/feed/'),
('Gear & Gadgets', 'https://arstechnica.com/gadgets/feed/'),
('Culture', 'https://arstechnica.com/cuture/feed/'),
('Health', 'https://arstechnica.com/health/feed/'),
('Policy', 'https://arstechnica.com/tech-policy/feed/'),
('Security', 'https://arstechnica.com/security/feed/'),
('Infinite Loop', 'https://arstechnica.com/tag/apple/feed/'),
('Opposable Thumbs', 'https://arstechnica.com/gaming/feed/'),
('Scientific Method', 'https://arstechnica.com/science/feed/'),
('Cars Technica', 'https://arstechnica.com/cars/feed/'),
('Staff', 'https://arstechnica.com/staff/feed/'),
('AI', 'https://arstechnica.com/staff/ai/feed/'),
('Space', 'https://arstechnica.com/space/feed/'),
]