Query posts using custom taxonomy and selected terms

You’re using a deprecated method of querying by taxonomy. Read the Codex and use tax_query:

$args=array(
    'post_type' => 'book',
    'post_status' => 'publish',
    'posts_per_page' => -1,
    'caller_get_posts'=> 1,
    'tax_query' => array(
        array(
            'taxonomy' => 'facts',
            'field' => 'slug',
            'terms' => 'information'
        )
    )
);

FYI, caller_get_posts is also deprecated.

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