A: It depends on the device. Use a E-ink tablet (like Kindle Paperwhite) or a tablet with a "Blue Light Filter" enabled. Set a timer for 20 minutes of reading followed by a break.

Champak stories never lecture. They present a conflict (e.g., lying to a friend) and show the consequences. Discussing these stories after reading a PDF is a great family bonding activity.

Kindle versions of Champak compilations are also available. Amazon converts these to a format similar to PDF (AZW/PDF). You can transfer these to a Fire Tablet or a Kindle e-reader.